JaebeenAhn · Oct 9, 2026 · Oct 12, 2026 · Oct 12, 2026 · Oct 12, 2026 · Oct 13, 2026
diff --git a/ATTRIBUTION.md b/ATTRIBUTION.md
@@ -31,6 +31,9 @@ artwork. The ribbon and menu icons stay original drawings.
 | `crates/media/tests/fixtures/damaged/*` (`ebml-header.mkv`, `ebml-position.webm`, `demux-loop.mp4`, `demux-loop.m4a`) | DeckCraft contributors | the `clip-*` and `tone*` fixtures above with bytes changed by a mutation fuzzer | CC0-1.0 | Damaged media must not panic or hang |
 | `crates/media/tests/fixtures/damaged/*` (`stsc-count.m4a`, `stsz-size.m4a`) | DeckCraft contributors | `tone.m4a` above with bytes changed by a mutation fuzzer | CC0-1.0 | Damaged MP4 sample tables must not abort |
 | `crates/media/tests/fixtures/make.sh` | DeckCraft contributors | this repository | MIT OR Apache-2.0 | Regenerates the media fixtures |
+| `crates/ui-egui/src/i18n/uk.tsv` | @dmatviichuk, assisted by Codex | Contributor-original Ukrainian translation in this repository; terminology checked against VESUM 6.8.6 and ULIF (validation tools/data are not bundled) | MIT OR Apache-2.0 (`LICENSE-MIT`, `LICENSE-APACHE`) | Ukrainian interface text |
+| `crates/ui-egui/src/i18n/pl.tsv` | @brzuchal, assisted by Claude | Contributor-original Polish translation written from the English interface labels in this repository; no other product localisation copied | MIT OR Apache-2.0 (`LICENSE-MIT`, `LICENSE-APACHE`) | Polish interface text |
+| `crates/ui-egui/src/i18n/ko.tsv` | @JaebeenAhn | Contributor-original Korean translation written from the English interface labels in this repository (1,486 entries); no other product localisation copied | MIT OR Apache-2.0 (`LICENSE-MIT`, `LICENSE-APACHE`) | Korean interface text |
 | `crates/render/tests/fixtures/colr-squares.ttf` | DeckCraft contributors | two squares as a COLRv0/CPAL test font, built by `make_colr_font.py` (fontTools as the builder only) | CC0-1.0 | Colour glyph rendering tests |
 | `crates/fonts/tests/fixtures/legacy-semibold.ttf` | DeckCraft contributors | a one-glyph Semibold face named like Segoe UI Semibold (its Windows family differs from the typographic one), built by `make_legacy_font.py` (fontTools as the builder only) | CC0-1.0 | Font lookup by Windows family name tests |
 | `crates/fonts/tests/fixtures/legacy-regular.ttf` | DeckCraft contributors | the same family's one-glyph Regular face, built by `make_legacy_font.py` (fontTools as the builder only) | CC0-1.0 | Font lookup by Windows family name tests |

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/ROADMAP.md b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-24 · **Change:** trivial (progress log: Edit Points handle drags with Shift, Ctrl/Cmd or Alt/Option set the point type; previous: trivial, progress log: scroll bars on the zoomed slide pane, #1157; previous: minor, native chart payloads stored in bounded ZIP members; previous: major, community PR wave 2026-10-14: ~60 landed items in the progress log, among them the Font, Paragraph, Photo Album, theme colour and font and Date and Time dialogs, presenter and show controls, the SmartArt Text Pane and PPTX corpus slices; breadth 84% after `cargo xtask parity`, ready stays ~55%, stage stays alpha; duplicated rows and headers folded; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-25 · **Change:** minor (Ukrainian and Polish UI catalogs and language selection; previous: trivial, progress log: Edit Points handle drags with Shift, Ctrl/Cmd or Alt/Option set the point type; previous: trivial, progress log: scroll bars on the zoomed slide pane, #1157; previous: minor, native chart payloads stored in bounded ZIP members; previous: major, community PR wave 2026-10-14: ~60 landed items in the progress log, among them the Font, Paragraph, Photo Album, theme colour and font and Date and Time dialogs, presenter and show controls, the SmartArt Text Pane and PPTX corpus slices; breadth 84% after `cargo xtask parity`, ready stays ~55%, stage stays alpha; duplicated rows and headers folded; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-24 · **Change:** trivial (progress log: Ctrl+wheel zoom during the slide show, #1286; previous: trivial, scroll bars on the zoomed slide pane, #1157; previous: minor, native chart payloads stored in bounded ZIP members; previous: major, community PR wave 2026-10-14: ~60 landed items in the progress log, among them the Font, Paragraph, Photo Album, theme colour and font and Date and Time dialogs, presenter and show controls, the SmartArt Text Pane and PPTX corpus slices; breadth 84% after `cargo xtask parity`, ready stays ~55%, stage stays alpha; duplicated rows and headers folded; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-24 · **Change:** trivial (progress log: picture and embedded object fills; previous: trivial, scroll bars on the zoomed slide pane, #1157; previous: minor, native chart payloads stored in bounded ZIP members; previous: major, community PR wave 2026-10-14: ~60 landed items in the progress log, among them the Font, Paragraph, Photo Album, theme colour and font and Date and Time dialogs, presenter and show controls, the SmartArt Text Pane and PPTX corpus slices; breadth 84% after `cargo xtask parity`, ready stays ~55%, stage stays alpha; duplicated rows and headers folded; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-22 · **Change:** trivial (fill and outline edits reach group members, #1079; stage and scores unchanged) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
@@ -90,7 +90,11 @@ EMF/SVG pictures, the data-loss and startup-crash bugs (#60, #40, #59) and the b
 
 ## Languages
 
-English only today; no string catalog yet (Ukrainian is in review as PR #34). Detail:
+English, Ukrainian and Polish: Preferences offers System language, English, Українська and Polski.
+Ukrainian and Polish OS/browser locales select those languages automatically; explicit desktop
+choices persist in `ui.json`.
+Menus, ribbon, command palette, panels, dialogs and presenter controls use the interface catalog.
+Presentation content and command IDs retain their original values. Detail:
 [docs/localization-parity.md](docs/localization-parity.md).
 
 | Language | Code | UI strings | Status | Hours to full |
@@ -108,8 +112,8 @@ English only today; no string catalog yet (Ukrainian is in review as PR #34). De
 | Korean | ko | 0% | none | 4–7 |
 | Vietnamese | vi | 0% | none | 3–5 |
 
-Plus 8–14 h once for the catalog infrastructure. Other languages shipped: none. PowerPoint for Mac
-ships 26.
+Other languages shipped: **Ukrainian (uk)**, with English fallback and bundled Cyrillic glyph
+coverage, and **Polish (pl)**. PowerPoint for Mac ships 26 languages; additional catalogs and native review remain.
 
 ## Upcoming
 
@@ -282,6 +286,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-12 | Render: line widths, dashes and arrowheads inside a group no longer scale with the group's child-coordinate mapping, so a group in a small legacy child space (scale about 1600) draws thin lines instead of covering the slide (#233) |
 | 2026-10-12 | `deckcraft-cli help` and each subcommand's `--help` explain the CLI to an agent; `describe` spells out a command's parameters and what it acts on; `commands` lists one command per line |
 | 2026-10-11 | Animated GIF export of the deck: the Export… dialog (Animated GIF), `file.export` format `gif`, CLI and MCP (#171) |
+| 2026-10-10 | Ukrainian UI catalog, system-language detection and persisted language choice (#15, #30); translated placeholder prompts preserve presentation content |
 | 2026-10-10 | Progress docs restructured to the craftrules standard; full re-measure (breadth 79%, ready ~55%, mainstream ~53%, essentials ~62%, alpha). Landed: Animation Painter (#54), Morph geometry outlines (#27), animated GIF playback (#39), hyperlink colour and following links in the show (#37, #45), date fields in their own format (#36), flipped shapes keep readable text (#35), show transition fix (#46), start screen from the Home button (#49), MCP export lists PDF (#65), OmaStore manifest (#57) |
 | 2026-10-09 | v0.4.0 released. UAX #9 bidi and Arabic shaping (#4), Morph with Words and Characters (#5), tables grow to fit and PDF cell text (#14), rotating log file (#7), DX12 default on Windows (#16), H.264/HEVC overflow hardening (#2), PPTX sniffing anywhere in the zip (#19) |
 | 2026-10-08 | v0.2.0 and v0.3.0 released: Windows arm64, Flatpak aarch64, AppImage zsync updates, branded DMG |
@@ -379,6 +384,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
 | 2026-10-11 | minor | Progress log: animated GIF export (#171); P2 breadth 36% → 37%, overall breadth stays 79% |
+| 2026-10-10 | minor | Added Ukrainian UI and language selection to the reorganized language summary |
 | 2026-10-10 | minor | Readiness-by-audience table with hours to ~95% for full, mainstream and essentials |
 | 2026-10-10 | minor | Added mainstream practitioner (~53%) and essentials user (~62%); features recomputed from written area weights, ready ~56% → ~55% |
 | 2026-10-10 | minor | Stage checked against the new core-workflow gate: passes, stays alpha |

diff --git a/apps/deckcraft-web/Cargo.toml b/apps/deckcraft-web/Cargo.toml
@@ -27,4 +27,4 @@ rfd = { workspace = true }
 wasm-bindgen = "0.2"
 wasm-bindgen-futures = "0.4"
 js-sys = "0.3"
-web-sys = { version = "0.3", features = ["Window", "Document", "Element", "HtmlElement", "HtmlCanvasElement", "HtmlAnchorElement", "Blob", "BlobPropertyBag", "Url", "Location", "CssStyleDeclaration"] }
+web-sys = { version = "0.3", features = ["Window", "Navigator", "Document", "Element", "HtmlElement", "HtmlCanvasElement", "HtmlAnchorElement", "Blob", "BlobPropertyBag", "Url", "Location", "CssStyleDeclaration"] }
diff --git a/apps/deckcraft-web/src/web.rs b/apps/deckcraft-web/src/web.rs
@@ -41,6 +41,7 @@ pub fn start() {
                     deckcraft_ui_egui::install_ime_pass_hooks(&cc.egui_ctx);
                     let inbox: Inbox = Inbox::default();
                     let mut app = SlideApp::new(Session::new(), services(inbox.clone(), cc.egui_ctx.clone()));
+                    app.services.system_locale = web_sys::window().and_then(|w| w.navigator().language());
                     let q = query();
                     if !q.contains("blank") {
                         if let Err(e) = deckcraft_engine::sample::open_sample(&mut app.session) {
@@ -123,10 +124,10 @@ fn services(inbox: Inbox, ctx: egui::Context) -> Services {
             let inbox = open_inbox.clone();
             let ctx = ctx.clone();
             let dialog = match purpose {
-                "picture" => rfd::AsyncFileDialog::new().add_filter("Pictures", PICTURE_EXTS),
-                "audio" => rfd::AsyncFileDialog::new().add_filter("Audio", AUDIO_EXTS),
-                "video" => rfd::AsyncFileDialog::new().add_filter("Video", VIDEO_EXTS),
-                _ => rfd::AsyncFileDialog::new().add_filter("Presentations", PRESENTATION_EXTS),
+                "picture" => rfd::AsyncFileDialog::new().add_filter(deckcraft_ui_egui::i18n::tr("Pictures"), PICTURE_EXTS),
+                "audio" => rfd::AsyncFileDialog::new().add_filter(deckcraft_ui_egui::i18n::tr("Audio"), AUDIO_EXTS),
+                "video" => rfd::AsyncFileDialog::new().add_filter(deckcraft_ui_egui::i18n::tr("Video"), VIDEO_EXTS),
+                _ => rfd::AsyncFileDialog::new().add_filter(deckcraft_ui_egui::i18n::tr("Presentations"), PRESENTATION_EXTS),
             };
             wasm_bindgen_futures::spawn_local(async move {
                 let Some(file) = dialog.pick_file().await else {

diff --git a/apps/deckcraft/Cargo.toml b/apps/deckcraft/Cargo.toml
@@ -11,6 +11,7 @@ default-run = "deckcraft"
 workspace = true
 
 [dependencies]
+sys-locale = "0.3.2"
 deckcraft-engine = { workspace = true }
 deckcraft-ui-egui = { workspace = true }
 deckcraft-media = { workspace = true }

diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
@@ -103,21 +103,24 @@ fn save_prefs(app: &SlideApp) {
 
 fn services() -> Services {
     Services {
+        system_locale: sys_locale::get_locale(),
         pick_open: Some(Box::new(|purpose: &str| {
             let d = rfd::FileDialog::new();
             let d = match purpose {
-                "picture" => d.add_filter("Pictures", &["png", "jpg", "jpeg", "gif", "webp", "bmp", "tif", "tiff"]),
+                "picture" => d.add_filter(deckcraft_ui_egui::i18n::tr("Pictures"), &["png", "jpg", "jpeg", "gif", "webp", "bmp", "tif", "tiff"]),
                 "audio" => d.add_filter(
-                    "Audio",
+                    deckcraft_ui_egui::i18n::tr("Audio"),
                     &["wav", "mp3", "m4a", "m4b", "aac", "flac", "ogg", "oga", "opus", "aif", "aiff", "aifc", "caf", "wma", "weba", "mka"],
                 ),
-                "video" => d.add_filter("Video", &["mp4", "m4v", "mov", "webm", "mkv", "wmv"]),
-                "theme" => d.add_filter("Themes and presentations", &["thmx", "pptx", "potx", "ppsx"]).add_filter("Office Theme", &["thmx"]),
+                "video" => d.add_filter(deckcraft_ui_egui::i18n::tr("Video"), &["mp4", "m4v", "mov", "webm", "mkv", "wmv"]),
+                "theme" => d
+                    .add_filter(deckcraft_ui_egui::i18n::tr("Themes and presentations"), &["thmx", "pptx", "potx", "ppsx"])
+                    .add_filter(deckcraft_ui_egui::i18n::tr("Office Theme"), &["thmx"]),
                 _ => d
-                    .add_filter("Presentations", &["deckcraft", "pptx", "potx", "ppsx"])
+                    .add_filter(deckcraft_ui_egui::i18n::tr("Presentations"), &["deckcraft", "pptx", "potx", "ppsx"])
                     .add_filter("DeckCraft", &["deckcraft"])
                     .add_filter("PowerPoint", &["pptx", "potx", "ppsx"])
-                    .add_filter("Outline", &["txt", "md"]),
+                    .add_filter(deckcraft_ui_egui::i18n::tr("Outline"), &["txt", "md"]),
             };
             d.pick_file().map(|p| p.to_string_lossy().to_string())
         })),
@@ -275,7 +278,8 @@ fn main() -> eframe::Result {
                 if let Ok(v) = app.session.execute("file.recovery.open", &serde_json::json!({}))
                     && let Some(n) = v.get("opened").and_then(|o| o.as_array()).map(Vec::len).filter(|n| *n > 0)
                 {
-                    app.set_status(format!("Recovered {n} unsaved presentation{} from the last session", if n == 1 { "" } else { "s" }));
+                    deckcraft_ui_egui::i18n::set_current(app.ui.interface_language.resolve(app.services.system_locale.as_deref()));
+                    app.set_status(deckcraft_ui_egui::i18n::recovered(n));
                 }
             }
             app.integrated_titlebar = cfg!(target_os = "macos");

diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
@@ -215,6 +215,8 @@ pub struct RenderOpts<'a> {
     pub scale: f64,
     /// Editor view: placeholder prompts and dashed placeholder outlines.
     pub edit: bool,
+    /// Optional interface prompt provider; custom layout prompts and document text stay intact.
+    pub placeholder_prompt: Option<fn(PhType) -> &'static str>,
     /// Draw shapes marked hidden (Selection pane) — the editor hides them like the show does.
     pub show_hidden: bool,
     /// Per-shape animation state.
@@ -250,6 +252,7 @@ impl Default for RenderOpts<'_> {
         RenderOpts {
             scale: 1.0,
             edit: false,
+            placeholder_prompt: None,
             show_hidden: false,
             state: None,
             skip: &[],
@@ -1421,7 +1424,7 @@ impl Renderer {
                 }
             } else if f.opts.edit && s.ph.is_some() {
                 let kind = s.ph_type().unwrap_or(PhType::Body);
-                let prompt_body = prompt_body(rctx, s, kind);
+                let prompt_body = prompt_body(rctx, s, kind, f.opts.placeholder_prompt.map(|prompt| prompt(kind)));
                 if !prompt_body.is_empty() {
                     let grey = Rgba::rgb(0x59, 0x59, 0x59);
                     draw_text(ctx, rctx, s, &prompt_body, tr, m, &f.fields, Some(grey));
@@ -2088,7 +2091,7 @@ fn arrowheads(ctx: &mut RenderContext, rctx: &Ctx, line: &Line, ph: Option<Rgba>
 }
 
 /// The prompt shown in an empty placeholder, formatted like its content would be.
-fn prompt_body(rctx: &Ctx, s: &Shape, kind: PhType) -> TextBody {
+fn prompt_body(rctx: &Ctx, s: &Shape, kind: PhType, interface_prompt: Option<&str>) -> TextBody {
     // Layout/master prompt text when the layout supplies a custom one.
     let (lp, _) = resolve::parents(rctx, s);
     let custom = lp.and_then(|l| l.ph.as_ref().filter(|p| p.has_custom_prompt).and(l.text.as_ref())).filter(|t| !t.is_empty());
@@ -2098,7 +2101,7 @@ fn prompt_body(rctx: &Ctx, s: &Shape, kind: PhType) -> TextBody {
     if matches!(rctx.owner, resolve::Owner::Layout | resolve::Owner::Master) {
         return TextBody::default();
     }
-    let txt = kind.prompt();
+    let txt = interface_prompt.unwrap_or_else(|| kind.prompt());
     if txt.is_empty() || kind.is_footer_kind() {
         return TextBody::default();
     }