diff --git a/THIRD_PARTY_NOTICES.md b/THIRD_PARTY_NOTICES.md
index d6cf093..8c1036f 100644
--- a/THIRD_PARTY_NOTICES.md
+++ b/THIRD_PARTY_NOTICES.md
@@ -25,6 +25,7 @@ Repo referensi hanya ada di `reference/` (git-ignored).
 | harmonica | v0.2.0 | MIT |
 | Docker SDK for Go (client) | v28.5.2+incompatible | Apache-2.0 |
 | docker/go-connections | v0.8.2 | Apache-2.0 |
+| go-yaml v3 | v3.0.1 | MIT |
 | purego *(transitif oto — driver ALSA)* | v0.11.0 | Apache-2.0 |
 | jfreymuth/pulse *(transitif oto — driver PulseAudio pure-Go)* | v0.1.3 | MIT |
 
diff --git a/cmd/tia-love/main.go b/cmd/tia-love/main.go
index a3f3611..d0376a4 100644
--- a/cmd/tia-love/main.go
+++ b/cmd/tia-love/main.go
@@ -10,18 +10,23 @@ import (
 
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/app"
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/cli"
+	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/i18n"
 )
 
-const usage = `tia — Terminal Is A My Way (Just Work)
+func usageText() string {
+	return fmt.Sprintf(`tia — Terminal Is A My Way (Just Work)
 
-Pemakaian:
-  tia-love             Buka TUI interaktif
-  tia-love doctor      Periksa kesehatan sistem (docker, audio, stack)
-  tia-love version     Tampilkan versi & build info
+%s
+  tia-love             %s
+  tia-love doctor      %s
+  tia-love version     %s
 
-Subcommand CLI lain (convert, ps, up, down, update)
-menyusul di Phase 2–3 — lihat docs/PRD.md §F-028.
-`
+%s
+`,
+		i18n.T("usage.usage"), i18n.T("usage.open"),
+		i18n.T("usage.doctor"), i18n.T("usage.version"),
+		i18n.T("usage.more"))
+}
 
 func main() {
 	if len(os.Args) > 1 {
@@ -32,7 +37,7 @@ func main() {
 		case "doctor":
 			os.Exit(cli.Doctor(os.Stdout))
 		default:
-			fmt.Fprintf(os.Stderr, "perintah tidak dikenal: %q\n\n%s", os.Args[1], usage)
+			fmt.Fprintf(os.Stderr, "%s\n\n%s", i18n.Tf("cli.unknownCommand", os.Args[1]), usageText())
 			os.Exit(2)
 		}
 	}
diff --git a/e2e/e2e_test.go b/e2e/e2e_test.go
index 7708a57..5e3f8b8 100644
--- a/e2e/e2e_test.go
+++ b/e2e/e2e_test.go
@@ -58,12 +58,17 @@ type tui struct {
 	waited bool
 }
 
-func startTUI(t *testing.T) *tui {
+func startTUI(t *testing.T) *tui { return startTUIEnv(t) }
+
+func startTUIEnv(t *testing.T, env ...string) *tui {
 	t.Helper()
 	if runtime.GOOS == "windows" {
 		t.Skip("e2e pty tidak didukung di Windows")
 	}
 	cmd := exec.Command(binPath)
+	if len(env) > 0 {
+		cmd.Env = append(os.Environ(), env...)
+	}
 	ptmx, err := pty.StartWithSize(cmd, &pty.Winsize{Rows: rows, Cols: cols})
 	if err != nil {
 		t.Fatalf("start pty: %v", err)
@@ -211,6 +216,18 @@ func TestDoctorCommand(t *testing.T) {
 	}
 }
 
+func TestEnglishLanguage(t *testing.T) {
+	u := startTUIEnv(t, "TIA_LANG=en")
+	u.waitContains("·  home", 5*time.Second)
+	u.waitContains("Clock", 5*time.Second)
+	u.send("1")
+	u.waitContains("·  containers", 3*time.Second)
+	u.send("q")
+	if code := u.waitExit(5 * time.Second); code != 0 {
+		t.Fatalf("exit code %d, mau 0", code)
+	}
+}
+
 func TestDashboardNavigation(t *testing.T) {
 	u := startTUI(t)
 	u.waitContains("beranda", 5*time.Second)
diff --git a/go.mod b/go.mod
index 53ee0c6..a35e9ef 100644
--- a/go.mod
+++ b/go.mod
@@ -9,6 +9,7 @@ require (
 	github.com/creack/pty v1.1.24
 	github.com/docker/docker v28.5.2+incompatible
 	github.com/ebitengine/oto/v3 v3.5.1
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
@@ -33,6 +34,7 @@ require (
 	github.com/go-logr/logr v1.4.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/jfreymuth/pulse v0.1.3 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.4.1 // indirect
 	github.com/mattn/go-runewidth v0.0.30 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
diff --git a/go.sum b/go.sum
index 7566ce5..8f52457 100644
--- a/go.sum
+++ b/go.sum
@@ -38,6 +38,7 @@ github.com/containerd/errdefs/pkg v0.3.0 h1:9IKJ06FvyNlexW690DXuQNx2KA2cUJXx151X
 github.com/containerd/errdefs/pkg v0.3.0/go.mod h1:NJw6s9HwNuRhnjJhM7pylWwMyAkmCQvQ4GpJHEqRLVk=
 github.com/containerd/log v0.2.0 h1:BewD/umNgVnoczglOpX8eRMyEy5t5iPlu5AIpnWDONc=
 github.com/containerd/log v0.2.0/go.mod h1:/M7L7CXKcPTfNC74XzaK+5H5KbO5+4lJVpuVI6vRLoM=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/creack/pty v1.1.24 h1:bJrF4RRfyJnbTJqzRLHzcGaZK1NeM5kTC9jGgovnR1s=
 github.com/creack/pty v1.1.24/go.mod h1:08sCNb52WyoAwi2QDyzUCTgcvVFhUzewun7wtTfvcwE=
 github.com/distribution/reference v0.6.0 h1:0IXCQ5g4/QMHHkarYzh5l+u8T3t73zM5QvfrDyIgxBk=
@@ -67,6 +68,10 @@ github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0 h1:/Tnpcb2E0Pz/tN9s3bfEY2Q8ePC
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0/go.mod h1:zOBXOsUaBSjKgmH4OGzV1esUpR3oUSCPYVd2cUBjKYY=
 github.com/jfreymuth/pulse v0.1.3 h1:bc5TdxiB8E+2INnFjFWWgyfgXtz2IyNNNCX+Wt/ZD14=
 github.com/jfreymuth/pulse v0.1.3/go.mod h1:cpYspI6YljhkUf1WLXLLDmeaaPFc3CnGLjDZf9dZ4no=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/lucasb-eyer/go-colorful v1.4.1 h1:1EO+WB73+EH8EVbzlrG3KLAfEypQWVHIBqlTf+2hNss=
 github.com/lucasb-eyer/go-colorful v1.4.1/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-runewidth v0.0.30 h1:+KUuiDA4fF0R1p5FeueHefjDm+GIM+kWfFnDjybOPgk=
@@ -91,6 +96,8 @@ github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
+github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
 github.com/sirupsen/logrus v1.10.2 h1:G2SED73/qrAu6YwbdxOD6peLkCBI3z7L+ykJFTXJBBo=
 github.com/sirupsen/logrus v1.10.2/go.mod h1:SLEg8TqYulVKKfIGHldVp2K2aYz2DKSVBq4g/H5bR7Q=
 github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
@@ -141,5 +148,10 @@ google.golang.org/grpc v1.83.2 h1:EManeRomTObA0BU7I8vXgg/78uE5MJ9M8B39EX2WscU=
 google.golang.org/grpc v1.83.2/go.mod h1:YPI1hK3kDked6iHvgX3tR0y+nX/qpMFKhPgFsokw1S8=
 google.golang.org/protobuf v1.36.12 h1:pJOKDDOyeXErUroCihFAd5LQuwXBSpVnKGrj5o/fwxc=
 google.golang.org/protobuf v1.36.12/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools/v3 v3.5.2 h1:7koQfIKdy+I8UTetycgUqXWSDwpgv193Ka+qRsmBY8Q=
 gotest.tools/v3 v3.5.2/go.mod h1:LtdLGcnqToBH83WByAAi/wiwSFCArdFIUV/xxN4pcjA=
diff --git a/internal/app/app.go b/internal/app/app.go
index 9c616a9..2aca5f8 100644
--- a/internal/app/app.go
+++ b/internal/app/app.go
@@ -12,6 +12,7 @@ import (
 
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/audio"
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/docker"
+	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/i18n"
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/sysinfo"
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/ui/animation"
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/ui/components"
@@ -133,7 +134,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.loading = false
 		if msg.err != nil {
 			m.loadErr = msg.err
-			m.toast.Show("✖ [ GAGAL ] Docker", msg.err.Error())
+			m.toast.Show(i18n.T("toast.dockerError"), msg.err.Error())
 			m.sound.Play(audio.NotifyError)
 		} else {
 			m.loadErr = nil
@@ -189,8 +190,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.sound.Play(audio.Click)
 			return m, tea.Batch(loadContainers(m.cl), loadInfo(m.cl))
 		case "t": // demo toast (sampai modal asli datang)
-			m.toast.Show("✔ [ SUKSES ] Konversi Berhasil Disimpan",
-				"Stack 'web-app' tersimpan di ~/.tia/stacks/web-app/")
+			m.toast.Show(i18n.T("toast.demoTitle"), i18n.T("toast.demoBody"))
 			m.sound.Play(audio.NotifySuccess)
 		case "j", "down":
 			if len(m.containers) > 0 && m.cursor < len(m.containers)-1 {
@@ -306,6 +306,13 @@ func truncate(s string, w int) string {
 	return string(r[:w-1]) + "…"
 }
 
+// field — label kolom (padding tetap agar nilai sejajar).
+func field(label string) string { return fieldW(label, 7) }
+
+func fieldW(label string, w int) string {
+	return text(fmt.Sprintf("%-*s", w, label))
+}
+
 // panel — kotak gaya mirador: judul di border atas (kiri), meta (kanan),
 // border redup; konten otomatis dipangkas/padded selebar panel.
 func panel(title, meta string, lines []string, w, h int, focused bool) string {
@@ -362,13 +369,13 @@ func (m Model) View() tea.View {
 	var body, footer string
 	switch m.view {
 	case viewHome:
-		header += dim("  ·  beranda")
+		header += dim("  ·  " + i18n.T("nav.home"))
 		body = m.homeBody()
-		footer = m.footerLine("[1/enter] kontainer · [t] toast · [a] reduced-motion · [q] keluar")
+		footer = m.footerLine(i18n.T("hint.footerHome"))
 	default:
-		header += dim("  ·  kontainer")
+		header += dim("  ·  " + i18n.T("nav.containers"))
 		body = lipgloss.JoinHorizontal(lipgloss.Top, m.sidebarView(), m.contentView())
-		footer = m.footerLine("[j/k] pilih · [r] muat ulang · [0/esc] beranda · [q] keluar")
+		footer = m.footerLine(i18n.T("hint.footerContainers"))
 	}
 
 	parts := []string{}
@@ -388,24 +395,24 @@ func (m Model) footerLine(hints string) string {
 	if m.animating {
 		anim = fmt.Sprintf("%d", m.fps)
 	}
-	return dim(truncate(fmt.Sprintf("%s   animasi %s fps · audio: %s", hints, anim, m.sound.Status()), m.width))
+	return dim(truncate(i18n.Tf("footer.status", hints, anim, m.sound.Status()), m.width))
 }
 
 func (m Model) sidebarView() string {
 	w, h := m.leftWidth(), m.bodyHeight()
-	title, meta := "Kontainer", fmt.Sprintf("(%d)", len(m.containers))
+	title, meta := i18n.T("section.containers"), fmt.Sprintf("(%d)", len(m.containers))
 	if m.loading {
-		meta = "memuat…"
+		meta = i18n.T("state.loading")
 	}
 
 	var lines []string
 	switch {
 	case m.loadErr != nil:
-		lines = append(lines, red("GAGAL memuat"), dim("tekan r untuk coba lagi"))
+		lines = append(lines, red(i18n.T("error.loadFailed")), dim(i18n.T("hint.retry")))
 	case m.loading:
-		lines = append(lines, dim("memuat…"))
+		lines = append(lines, dim(i18n.T("state.loading")))
 	case len(m.containers) == 0:
-		lines = append(lines, dim("belum ada kontainer"))
+		lines = append(lines, dim(i18n.T("state.noContainers")))
 	default:
 		rows := h - 2
 		start := m.scrollStart()
@@ -425,25 +432,25 @@ func (m Model) sidebarView() string {
 
 func (m Model) contentView() string {
 	w, h := m.width-m.leftWidth(), m.bodyHeight()
-	title, meta := "Detail", ""
+	title, meta := i18n.T("section.detail"), ""
 
 	var lines []string
 	switch {
 	case m.loadErr != nil:
-		lines = append(lines, red("Gagal memuat daftar kontainer"), "", dim(truncate(m.loadErr.Error(), w-6)))
+		lines = append(lines, red(i18n.T("error.loadContainers")), "", dim(truncate(m.loadErr.Error(), w-6)))
 	case len(m.containers) == 0:
-		lines = append(lines, dim("Belum ada kontainer — jalankan sesuatu dengan Docker, lalu tekan r."))
+		lines = append(lines, dim(i18n.T("hint.noContainers")))
 	default:
 		c := m.containers[min(m.cursor, len(m.containers)-1)]
 		glyph, color := stateStyle(c.State)
 		title, meta = c.Name, c.State
 		lines = append(lines,
-			text("ID     ")+dim(c.ID),
-			text("Image  ")+dim(truncate(c.Image, w-20)),
-			text("State  ")+styled(color, glyph+" "+c.State),
-			text("Status ")+dim(truncate(c.Status, w-20)),
+			field(i18n.T("field.id"))+dim(c.ID),
+			field(i18n.T("field.image"))+dim(truncate(c.Image, w-20)),
+			field(i18n.T("field.state"))+styled(color, glyph+" "+i18n.TOr("state."+c.State, c.State)),
+			field(i18n.T("field.status"))+dim(truncate(c.Status, w-20)),
 			"",
-			dim("Tab detail (Log · Statistik · Konfigurasi) menyusul di Phase 2."),
+			dim(i18n.T("hint.tabsComing")),
 		)
 	}
 	return panel(title, meta, lines, w, h, false)
diff --git a/internal/app/home.go b/internal/app/home.go
index 6181a61..d81a76f 100644
--- a/internal/app/home.go
+++ b/internal/app/home.go
@@ -8,6 +8,7 @@ import (
 
 	"charm.land/lipgloss/v2"
 
+	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/i18n"
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/ui/components"
 )
 
@@ -38,9 +39,9 @@ func (m Model) homeBody() string {
 	k1 := int(float64(W) * 0.55)
 	k2 := W - k1
 	row2 := lipgloss.JoinHorizontal(lipgloss.Top,
-		panel("Kontainer", fmt.Sprintf("%d total", len(m.containers)),
+		panel(i18n.T("section.containers"), i18n.Tf("fmt.countTotal", len(m.containers)),
 			m.miniContainerLines(row2H-2), k1, row2H, false),
-		panel("Aktivitas", "Phase 2", activityLines(), k2, row2H, false),
+		panel(i18n.T("section.activity"), i18n.Tf("fmt.phase", "2"), activityLines(), k2, row2H, false),
 	)
 
 	return row1 + "\n" + row2
@@ -52,31 +53,32 @@ func (m Model) clockPanel(w, h int) string {
 	for i, r := range rows {
 		rows[i] = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("#cba6f7")).Render(r)
 	}
-	lines := append(rows, "", dim("  "+hariID(now)+", "+tanggalID(now)+" · "+now.Format("MST")))
+	tanggal := fmt.Sprintf("%d %s %d", now.Day(), i18n.MonthName(now), now.Year())
+	lines := append(rows, "", dim("  "+i18n.WeekdayName(now)+", "+tanggal+" · "+now.Format("MST")))
 	if len(lines) > h-2 {
 		lines = lines[:h-2]
 	}
-	return panel("Jam", "", lines, w, h, false)
+	return panel(i18n.T("section.clock"), "", lines, w, h, false)
 }
 
 func (m Model) dockerPanel(w, h int) string {
 	var lines []string
 	switch {
 	case m.engineErr != nil:
-		lines = append(lines, red("GAGAL"), "", dim(truncate(m.engineErr.Error(), w-6)))
+		lines = append(lines, red(i18n.T("error.fail")), "", dim(truncate(m.engineErr.Error(), w-6)))
 	case m.engine.ServerVersion == "":
-		lines = append(lines, dim("memuat…"))
+		lines = append(lines, dim(i18n.T("state.loading")))
 	default:
 		lines = append(lines,
-			text("Engine   ")+dim(m.engine.ServerVersion),
-			text("API      ")+dim(m.engine.APIVersion),
-			text("Kontainer ")+dim(fmt.Sprintf("%d jalan / %d total", m.engine.Running, m.engine.Containers)),
-			text("Image    ")+dim(fmt.Sprintf("%d", m.engine.Images)),
+			fieldW(i18n.T("field.engine"), 9)+dim(m.engine.ServerVersion),
+			fieldW(i18n.T("field.api"), 9)+dim(m.engine.APIVersion),
+			fieldW(i18n.T("section.containers"), 9)+dim(i18n.Tf("fmt.dockerContainers", m.engine.Running, m.engine.Containers)),
+			fieldW(i18n.T("field.image"), 9)+dim(fmt.Sprintf("%d", m.engine.Images)),
 			"",
-			styled("#a6e3a1", "● terhubung"),
+			styled("#a6e3a1", i18n.T("state.connected")),
 		)
 	}
-	return panel("Docker", "lokal", lines, w, h, false)
+	return panel("Docker", i18n.T("host.local"), lines, w, h, false)
 }
 
 func (m Model) hostPanel(w, h int) string {
@@ -90,21 +92,21 @@ func (m Model) hostPanel(w, h int) string {
 		pct = int((s.MemTotal - s.MemAvail) * 100 / s.MemTotal)
 	}
 	lines := []string{
-		text("Host    ") + dim(m.hostname),
-		text("CPU     ") + dim(fmt.Sprintf("%d core · load %.2f", cpus, s.Load1)),
-		text("RAM     ") + dim(fmt.Sprintf("%3d%% ", pct)) + memBar(pct, 10) +
+		fieldW(i18n.T("field.host"), 9) + dim(m.hostname),
+		fieldW(i18n.T("field.cpu"), 9) + dim(i18n.Tf("fmt.coreLoad", cpus, s.Load1)),
+		fieldW(i18n.T("field.ram"), 9) + dim(i18n.Tf("fmt.ramUsage", pct)) + memBar(pct, 10) +
 			dim(fmt.Sprintf(" %s/%s", humanKBs(s.MemTotal-s.MemAvail), humanKBs(s.MemTotal))),
-		text("Uptime  ") + dim(humanDuration(s.Uptime)),
+		fieldW(i18n.T("field.uptime"), 9) + dim(humanDuration(s.Uptime)),
 	}
-	return panel("Host", "", lines, w, h, false)
+	return panel(i18n.T("section.host"), "", lines, w, h, false)
 }
 
 func (m Model) miniContainerLines(maxLines int) []string {
 	if m.loading && len(m.containers) == 0 {
-		return []string{dim("memuat…")}
+		return []string{dim(i18n.T("state.loading"))}
 	}
 	if len(m.containers) == 0 {
-		return []string{dim("belum ada kontainer — tekan 1")}
+		return []string{dim(i18n.T("hint.miniNoContainers"))}
 	}
 	max := maxLines
 	if len(m.containers) > max {
@@ -117,31 +119,22 @@ func (m Model) miniContainerLines(maxLines int) []string {
 		lines = append(lines, styled(color, glyph)+" "+text(truncate(c.Name, 24))+"  "+dim(truncate(c.Image, 32)))
 	}
 	if extra := len(m.containers) - len(lines); extra > 0 {
-		lines = append(lines, dim(fmt.Sprintf("… %d lainnya (tekan 1)", extra)))
+		lines = append(lines, dim(i18n.Tf("fmt.listMore", extra)))
 	}
 	return lines
 }
 
 func activityLines() []string {
 	return []string{
-		dim("Listener Docker events menyusul (Phase 2)."),
+		dim(i18n.T("activity.coming")),
 		"",
-		dim("Panel ini akan menampilkan 5 aktivitas terbaru:"),
-		dim("kontainer start/stop, image di-pull, error terakhir."),
+		dim(i18n.T("activity.willShow")),
+		dim(i18n.T("activity.examples")),
 	}
 }
 
 // --- small formatting helpers ---
 
-var hari = [...]string{"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"}
-var bulan = [...]string{"Januari", "Februari", "Maret", "April", "Mei", "Juni", "Juli", "Agustus", "September", "Oktober", "November", "Desember"}
-
-func hariID(t time.Time) string { return hari[int(t.Weekday())] }
-
-func tanggalID(t time.Time) string {
-	return fmt.Sprintf("%d %s %d", t.Day(), bulan[int(t.Month())-1], t.Year())
-}
-
 func humanKB(kb uint64) string {
 	f := float64(kb) * 1024
 	units := []string{"B", "KB", "MB", "GB", "TB"}
@@ -167,11 +160,11 @@ func humanDuration(sec float64) string {
 	mins := int(d.Minutes()) % 60
 	switch {
 	case days > 0:
-		return fmt.Sprintf("%d hari %d jam", days, hours)
+		return i18n.Tf("duration.days", days, hours)
 	case hours > 0:
-		return fmt.Sprintf("%d jam %d mnt", hours, mins)
+		return i18n.Tf("duration.hours", hours, mins)
 	default:
-		return fmt.Sprintf("%d mnt", mins)
+		return i18n.Tf("duration.minutes", mins)
 	}
 }
 
diff --git a/internal/cli/doctor.go b/internal/cli/doctor.go
index 86c1133..0255270 100644
--- a/internal/cli/doctor.go
+++ b/internal/cli/doctor.go
@@ -13,13 +13,11 @@ import (
 
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/audio"
 	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/docker"
+	"gitea.oxpoe.qzz.io/oxpoe/tia-love/internal/i18n"
 )
 
 // Doctor memeriksa kesehatan sistem dan menulis laporan ke w.
 // Kode keluar: 0 = sehat (warning boleh), 1 = ada kegagalan fatal.
-//
-// shortcut: teks masih hardcode Bahasa Indonesia — pindah ke katalog i18n
-// saat F-023 masuk (Phase 1).
 func Doctor(w io.Writer) int {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
@@ -29,18 +27,20 @@ func Doctor(w io.Writer) int {
 	// Docker — dependency inti.
 	switch cl, err := docker.New(); {
 	case err != nil:
-		fmt.Fprintf(w, "docker   : GAGAL  %v\n", err)
+		fmt.Fprintf(w, "docker   : %s  %v\n", i18n.T("error.fail"), err)
 		fail++
 	default:
 		defer cl.Close()
 		if err := cl.Ping(ctx); err != nil {
-			fmt.Fprintf(w, "docker   : GAGAL  daemon tidak merespons: %v\n", err)
+			fmt.Fprintf(w, "docker   : %s  %s\n", i18n.T("error.fail"),
+				i18n.Tf("doctor.dockerDaemonUnreachable", err))
 			fail++
 		} else if info, err := cl.Info(ctx); err != nil {
-			fmt.Fprintf(w, "docker   : PERINGATAN  %v\n", err)
+			fmt.Fprintf(w, "docker   : %s  %v\n", i18n.T("error.warn"), err)
 		} else {
-			fmt.Fprintf(w, "docker   : OK  engine %s (API %s) · %d/%d kontainer berjalan · %d image\n",
-				info.ServerVersion, info.APIVersion, info.Running, info.Containers, info.Images)
+			fmt.Fprintf(w, "docker   : %s  %s\n", i18n.T("error.ok"),
+				i18n.Tf("doctor.dockerOk", info.ServerVersion, info.APIVersion,
+					info.Running, info.Containers, info.Images))
 		}
 	}
 
@@ -56,7 +56,7 @@ func Doctor(w io.Writer) int {
 	if st, err := os.Stat(stacks); err == nil && st.IsDir() {
 		fmt.Fprintf(w, "stacks   : %s\n", stacks)
 	} else {
-		fmt.Fprintf(w, "stacks   : %s (belum ada — dibuat saat onboarding)\n", stacks)
+		fmt.Fprintf(w, "stacks   : %s\n", i18n.Tf("doctor.stacksMissing", stacks))
 	}
 
 	if fail > 0 {
diff --git a/internal/docker/client.go b/internal/docker/client.go
index 7130dfa..d26dd5d 100644
--- a/internal/docker/client.go
+++ b/internal/docker/client.go
@@ -76,7 +76,7 @@ type Container struct {
 func (c *Client) ListContainers(ctx context.Context) ([]Container, error) {
 	list, err := c.cli.ContainerList(ctx, container.ListOptions{All: true})
 	if err != nil {
-		return nil, fmt.Errorf("docker: daftar kontainer: %w", err)
+		return nil, fmt.Errorf("docker: container list: %w", err)
 	}
 	out := make([]Container, 0, len(list))
 	for _, ct := range list {
diff --git a/internal/i18n/i18n.go b/internal/i18n/i18n.go
new file mode 100644
index 0000000..dfb7354
--- /dev/null
+++ b/internal/i18n/i18n.go
@@ -0,0 +1,162 @@
+// Package i18n — katalog bahasa (F-023). Bahasa Indonesia default,
+// fallback otomatis ke English bila kunci belum ada di katalog aktif.
+// Katalog di-embed ke binary (tetap single binary).
+package i18n
+
+import (
+	"embed"
+	"fmt"
+	"os"
+	"sort"
+	"sync"
+	"time"
+
+	"gopkg.in/yaml.v3"
+)
+
+//go:embed locales/*.yaml
+var locales embed.FS
+
+const (
+	DefaultLang  = "id"
+	FallbackLang = "en"
+)
+
+var (
+	mu       sync.RWMutex
+	active   = DefaultLang
+	catalogs = map[string]map[string]string{}
+)
+
+func init() {
+	for _, lang := range []string{DefaultLang, FallbackLang} {
+		if c, err := load(lang); err == nil {
+			catalogs[lang] = c
+		}
+	}
+	if l := os.Getenv("TIA_LANG"); l != "" {
+		active = l
+	}
+}
+
+// shortcut: bahasa hanya dari TIA_LANG + default id — akan dibaca dari
+// config.yaml (ui.language) begitu internal/config masuk (Phase 1).
+func load(lang string) (map[string]string, error) {
+	b, err := locales.ReadFile("locales/" + lang + ".yaml")
+	if err != nil {
+		return nil, err
+	}
+	var raw map[string]any
+	if err := yaml.Unmarshal(b, &raw); err != nil {
+		return nil, err
+	}
+	out := map[string]string{}
+	flatten("", raw, out)
+	return out, nil
+}
+
+func flatten(prefix string, in map[string]any, out map[string]string) {
+	for k, v := range in {
+		key := k
+		if prefix != "" {
+			key = prefix + "." + k
+		}
+		switch vv := v.(type) {
+		case map[string]any:
+			flatten(key, vv, out)
+		case string:
+			out[key] = vv
+		default:
+			out[key] = fmt.Sprint(vv)
+		}
+	}
+}
+
+// SetLang mengganti bahasa aktif (dipakai wizard & layar Pengaturan).
+func SetLang(lang string) {
+	mu.Lock()
+	active = lang
+	mu.Unlock()
+}
+
+func Lang() string {
+	mu.RLock()
+	defer mu.RUnlock()
+	return active
+}
+
+// T — terjemahan; fallback: bahasa aktif → en → key itu sendiri.
+func T(key string) string {
+	mu.RLock()
+	lang := active
+	mu.RUnlock()
+	if v, ok := catalogs[lang][key]; ok {
+		return v
+	}
+	if v, ok := catalogs[FallbackLang][key]; ok {
+		return v
+	}
+	return key
+}
+
+// Tf — T + fmt.Sprintf.
+func Tf(key string, args ...any) string {
+	s := T(key)
+	if len(args) == 0 {
+		return s
+	}
+	return fmt.Sprintf(s, args...)
+}
+
+// TOr — T dengan fallback eksplisit (mis. nama state Docker apa adanya).
+func TOr(key, fallback string) string {
+	mu.RLock()
+	lang := active
+	mu.RUnlock()
+	if v, ok := catalogs[lang][key]; ok {
+		return v
+	}
+	if v, ok := catalogs[FallbackLang][key]; ok {
+		return v
+	}
+	return fallback
+}
+
+// Keys — semua kunci pada katalog lang (untuk tes paritas katalog).
+func Keys(lang string) []string {
+	out := make([]string, 0, len(catalogs[lang]))
+	for k := range catalogs[lang] {
+		out = append(out, k)
+	}
+	sort.Strings(out)
+	return out
+}
+
+// --- nama hari & bulan (locale data) ---
+
+var weekdays = map[string][]string{
+	"id": {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"},
+	"en": {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"},
+}
+
+var months = map[string][]string{
+	"id": {"Januari", "Februari", "Maret", "April", "Mei", "Juni", "Juli", "Agustus", "September", "Oktober", "November", "Desember"},
+	"en": {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"},
+}
+
+func WeekdayName(t time.Time) string { return pick(weekdays, int(t.Weekday())) }
+func MonthName(t time.Time) string   { return pick(months, int(t.Month())-1) }
+
+func pick(m map[string][]string, i int) string {
+	mu.RLock()
+	lang := active
+	mu.RUnlock()
+	arr, ok := m[lang]
+	if !ok {
+		arr = m[FallbackLang]
+	}
+	if i < 0 || i >= len(arr) {
+		return ""
+	}
+	return arr[i]
+}
diff --git a/internal/i18n/i18n_test.go b/internal/i18n/i18n_test.go
new file mode 100644
index 0000000..4898da0
--- /dev/null
+++ b/internal/i18n/i18n_test.go
@@ -0,0 +1,73 @@
+package i18n
+
+import (
+	"testing"
+	"time"
+)
+
+// Paritas katalog: setiap kunci harus ada di kedua bahasa.
+func TestCatalogParity(t *testing.T) {
+	id := Keys("id")
+	en := Keys("en")
+	if len(id) == 0 || len(en) == 0 {
+		t.Fatalf("katalog tidak termuat: id=%d en=%d", len(id), len(en))
+	}
+	inEN := map[string]bool{}
+	for _, k := range en {
+		inEN[k] = true
+	}
+	inID := map[string]bool{}
+	for _, k := range id {
+		inID[k] = true
+	}
+	for _, k := range id {
+		if !inEN[k] {
+			t.Errorf("kunci %q ada di id tapi tidak di en", k)
+		}
+	}
+	for _, k := range en {
+		if !inID[k] {
+			t.Errorf("kunci %q ada di en tapi tidak di id", k)
+		}
+	}
+}
+
+func TestTFallback(t *testing.T) {
+	SetLang("id")
+	if got := T("nav.home"); got != "beranda" {
+		t.Fatalf("id nav.home = %q", got)
+	}
+	SetLang("en")
+	if got := T("nav.home"); got != "home" {
+		t.Fatalf("en nav.home = %q", got)
+	}
+	// fallback: kunci tak dikenal → key itu sendiri
+	if got := T("tidak.ada"); got != "tidak.ada" {
+		t.Fatalf("fallback = %q", got)
+	}
+	if got := TOr("state.tidakada", "raw"); got != "raw" {
+		t.Fatalf("TOr = %q", got)
+	}
+	SetLang(DefaultLang)
+}
+
+func TestTf(t *testing.T) {
+	SetLang("id")
+	got := Tf("fmt.countTotal", 7)
+	if got != "7 total" {
+		t.Fatalf("Tf = %q", got)
+	}
+}
+
+func TestLocaleDates(t *testing.T) {
+	d := time.Date(2026, 10, 15, 0, 0, 0, 0, time.UTC) // Kamis
+	SetLang("id")
+	if WeekdayName(d) != "Kamis" || MonthName(d) != "Oktober" {
+		t.Fatalf("id: %s %s", WeekdayName(d), MonthName(d))
+	}
+	SetLang("en")
+	if WeekdayName(d) != "Thursday" || MonthName(d) != "October" {
+		t.Fatalf("en: %s %s", WeekdayName(d), MonthName(d))
+	}
+	SetLang(DefaultLang)
+}
diff --git a/internal/i18n/locales/en.yaml b/internal/i18n/locales/en.yaml
new file mode 100644
index 0000000..104902e
--- /dev/null
+++ b/internal/i18n/locales/en.yaml
@@ -0,0 +1,96 @@
+# English catalog (fallback) — F-023
+# Rule: technical terms (Env, Image, Volume, Stack, Shell, CPU, RAM, PID, Log,
+# Docker, API) are not translated.
+
+nav:
+  home: "home"
+  containers: "containers"
+
+section:
+  clock: "Clock"
+  host: "Host"
+  containers: "Containers"
+  activity: "Activity"
+  detail: "Detail"
+
+host:
+  local: "local"
+
+field:
+  id: "ID"
+  image: "Image"
+  state: "State"
+  status: "Status"
+  host: "Host"
+  cpu: "CPU"
+  ram: "RAM"
+  uptime: "Uptime"
+  engine: "Engine"
+  api: "API"
+
+state:
+  loading: "loading…"
+  noContainers: "no containers yet"
+  connected: "● connected"
+  running: "running"
+  exited: "stopped"
+  paused: "paused"
+  restarting: "restarting"
+  created: "created"
+  dead: "dead"
+
+error:
+  fail: "FAILED"
+  warn: "WARNING"
+  ok: "OK"
+  loadFailed: "Failed to load"
+  loadContainers: "Failed to load container list"
+
+hint:
+  retry: "press r to retry"
+  noContainers: "No containers yet — run something with Docker, then press r."
+  miniNoContainers: "no containers yet — press 1"
+  tabsComing: "Detail tabs (Logs · Stats · Config) coming in Phase 2."
+  footerHome: "[1/enter] containers · [t] toast · [a] reduced-motion · [q] quit"
+  footerContainers: "[j/k] select · [r] reload · [0/esc] home · [q] quit"
+
+footer:
+  status: "%s   animation %s fps · audio: %s"
+
+toast:
+  demoTitle: "✔ [ SUCCESS ] Conversion Saved"
+  demoBody: "Stack 'web-app' saved to ~/.tia/stacks/web-app/"
+  dockerError: "✖ [ FAILED ] Docker"
+
+activity:
+  coming: "Docker events listener coming (Phase 2)."
+  willShow: "This panel will show the 5 most recent events:"
+  examples: "container start/stop, image pulls, latest error."
+
+fmt:
+  countTotal: "%d total"
+  dockerContainers: "%d running / %d total"
+  coreLoad: "%d core · load %.2f"
+  ramUsage: "%3d%% "
+  listMore: "… %d more (press 1)"
+  phase: "Phase %s"
+
+duration:
+  days: "%d days %d hours"
+  hours: "%d hours %d mins"
+  minutes: "%d mins"
+
+doctor:
+  dockerDaemonUnreachable: "daemon not responding: %v"
+  dockerOk: "engine %s (API %s) · %d/%d containers running · %d images"
+  stacksMissing: "%s (missing — created during onboarding)"
+
+cli:
+  unknownCommand: "unknown command: %q"
+
+usage:
+  usage: "Usage:"
+  open: "Open the interactive TUI"
+  doctor: "Check system health (docker, audio, stacks)"
+  version: "Show version & build info"
+  more: "Other CLI subcommands (convert, ps, up, down, update) arriving in Phase 2–3 — see docs/PRD.md §F-028."
diff --git a/internal/i18n/locales/id.yaml b/internal/i18n/locales/id.yaml
new file mode 100644
index 0000000..94b426b
--- /dev/null
+++ b/internal/i18n/locales/id.yaml
@@ -0,0 +1,96 @@
+# Katalog Bahasa Indonesia (default) — F-023
+# Aturan: istilah teknis (Env, Image, Volume, Stack, Shell, CPU, RAM, PID, Log,
+# Docker, API) tidak diterjemahkan.
+
+nav:
+  home: "beranda"
+  containers: "kontainer"
+
+section:
+  clock: "Jam"
+  host: "Host"
+  containers: "Kontainer"
+  activity: "Aktivitas"
+  detail: "Detail"
+
+host:
+  local: "lokal"
+
+field:
+  id: "ID"
+  image: "Image"
+  state: "State"
+  status: "Status"
+  host: "Host"
+  cpu: "CPU"
+  ram: "RAM"
+  uptime: "Uptime"
+  engine: "Engine"
+  api: "API"
+
+state:
+  loading: "memuat…"
+  noContainers: "belum ada kontainer"
+  connected: "● terhubung"
+  running: "berjalan"
+  exited: "berhenti"
+  paused: "jeda"
+  restarting: "memulai ulang"
+  created: "dibuat"
+  dead: "mati"
+
+error:
+  fail: "GAGAL"
+  warn: "PERINGATAN"
+  ok: "OK"
+  loadFailed: "GAGAL memuat"
+  loadContainers: "Gagal memuat daftar kontainer"
+
+hint:
+  retry: "tekan r untuk coba lagi"
+  noContainers: "Belum ada kontainer — jalankan sesuatu dengan Docker, lalu tekan r."
+  miniNoContainers: "belum ada kontainer — tekan 1"
+  tabsComing: "Tab detail (Log · Statistik · Konfigurasi) menyusul di Phase 2."
+  footerHome: "[1/enter] kontainer · [t] toast · [a] reduced-motion · [q] keluar"
+  footerContainers: "[j/k] pilih · [r] muat ulang · [0/esc] beranda · [q] keluar"
+
+footer:
+  status: "%s   animasi %s fps · audio: %s"
+
+toast:
+  demoTitle: "✔ [ SUKSES ] Konversi Berhasil Disimpan"
+  demoBody: "Stack 'web-app' tersimpan di ~/.tia/stacks/web-app/"
+  dockerError: "✖ [ GAGAL ] Docker"
+
+activity:
+  coming: "Listener Docker events menyusul (Phase 2)."
+  willShow: "Panel ini akan menampilkan 5 aktivitas terbaru:"
+  examples: "kontainer start/stop, image di-pull, error terakhir."
+
+fmt:
+  countTotal: "%d total"
+  dockerContainers: "%d jalan / %d total"
+  coreLoad: "%d core · load %.2f"
+  ramUsage: "%3d%% "
+  listMore: "… %d lainnya (tekan 1)"
+  phase: "Phase %s"
+
+duration:
+  days: "%d hari %d jam"
+  hours: "%d jam %d mnt"
+  minutes: "%d mnt"
+
+doctor:
+  dockerDaemonUnreachable: "daemon tidak merespons: %v"
+  dockerOk: "engine %s (API %s) · %d/%d kontainer berjalan · %d image"
+  stacksMissing: "%s (belum ada — dibuat saat onboarding)"
+
+cli:
+  unknownCommand: "perintah tidak dikenal: %q"
+
+usage:
+  usage: "Pemakaian:"
+  open: "Buka TUI interaktif"
+  doctor: "Periksa kesehatan sistem (docker, audio, stack)"
+  version: "Tampilkan versi & build info"
+  more: "Subcommand CLI lain (convert, ps, up, down, update) menyusul di Phase 2–3 — lihat docs/PRD.md §F-028."