diff --git a/packages/vscode/l10n/bundle.l10n.tr.json b/packages/vscode/l10n/bundle.l10n.tr.json
index 99518c7f..ca5f9134 100644
--- a/packages/vscode/l10n/bundle.l10n.tr.json
+++ b/packages/vscode/l10n/bundle.l10n.tr.json
@@ -13,6 +13,13 @@
   "OpenChamber [Improve Code]: No active editor": "OpenChamber [Kodu İyileştir]: Aktif düzenleyici yok",
   "OpenChamber [Improve Code]: No text selected": "OpenChamber [Kodu İyileştir]: Metin seçilmedi",
   "Improve the following Code:": "Aşağıdaki Kodu iyileştir:",
+  "OpenChamber [Add Comment]: No active editor": "OpenChamber [Yorum Ekle]: Aktif düzenleyici yok",
+  "OpenChamber [Add Comment]: File is outside the workspace": "OpenChamber [Yorum Ekle]: Dosya çalışma alanının dışında",
+  "OpenChamber [Add Comment]: The comment never reached the chat and was discarded": "OpenChamber [Yorum Ekle]: Yorum sohbete ulaşmadı ve atıldı",
+  "Comment on line {0}": "{0}. satıra yorum",
+  "Comment on lines {0}-{1}": "{0}-{1}. satırlara yorum",
+  "OpenChamber": "OpenChamber",
+  "Not sent yet": "Henüz gönderilmedi",
   "OpenCode CLI not found. Install it and ensure it's in PATH.": "OpenCode CLI bulunamadı. Yükleyin ve PATH içinde olduğundan emin olun.",
   "OpenCode CLI not found. Please install it and ensure it's in PATH.": "OpenCode CLI bulunamadı. Lütfen yükleyin ve PATH içinde olduğundan emin olun.",
   "More Info": "Daha fazla bilgi",
diff --git a/packages/vscode/package.nls.tr.json b/packages/vscode/package.nls.tr.json
index a59693a6..2a61279c 100644
--- a/packages/vscode/package.nls.tr.json
+++ b/packages/vscode/package.nls.tr.json
@@ -10,6 +10,9 @@
   "command.openNewSessionInEditor.title": "Düzenleyicide yeni oturum aç",
   "command.openCurrentOrNewSessionInEditor.title": "Oturumu düzenleyicide aç",
   "command.addToContext.title": "Bağlama ekle",
+  "command.addLineComment.title": "Yorum ekle",
+  "command.submitLineComment.title": "Yorum yap",
+  "command.removeLineComment.title": "Yorumu kaldır",
   "command.explain.title": "Açıkla",
   "command.improveCode.title": "Kodu iyileştir",
   "command.newSession.title": "Yeni oturum",
diff --git a/packages/vscode/src/DOCUMENTATION.md b/packages/vscode/src/DOCUMENTATION.md
index 79d843ff..8cabb2b6 100644
--- a/packages/vscode/src/DOCUMENTATION.md
+++ b/packages/vscode/src/DOCUMENTATION.md
@@ -190,3 +190,17 @@ resolves `$XDG_CONFIG_HOME/opencode` at extension startup, falling back to
 No files are migrated. The behavior GET bridge response includes the effective
 `path` for both existing and missing AGENTS.md files; shared Settings uses it
 in the warning.
+
+## Extension localization
+
+Two bundles carry extension-host text: `package.nls*.json` for the manifest
+`%token%` strings and `l10n/bundle.l10n*.json` for the `t(...)` call sites.
+Every locale file must cover the full English key set with the same `{0}`
+placeholders — VS Code silently falls back to English per missing key, so a
+half-translated locale looks like a shipped feature. `localizationBundles.test.ts`
+enforces that, and it is the check to run whenever a feature adds a new string.
+
+The pre-bundle loading splash in `webviewHtml.ts` is separate: its strings are
+inlined in the generated HTML and chosen from OpenChamber's own saved locale
+(`openchamber.i18n.v1` in webview localStorage), not from VS Code's display
+language, because the splash renders before the webview bundle loads.
diff --git a/packages/vscode/src/localizationBundles.test.ts b/packages/vscode/src/localizationBundles.test.ts
new file mode 100644
index 00000000..45a31c07
--- /dev/null
+++ b/packages/vscode/src/localizationBundles.test.ts
@@ -0,0 +1,45 @@
+import assert from 'node:assert/strict';
+import * as fs from 'node:fs';
+import * as path from 'node:path';
+import { describe, test } from 'node:test';
+
+const packageRoot = path.resolve(__dirname, '..');
+
+const readJson = (relativePath: string): Record<string, string> =>
+  JSON.parse(fs.readFileSync(path.join(packageRoot, relativePath), 'utf8'));
+
+const placeholders = (value: string): string[] => (value.match(/\{\d+\}/g) ?? []).sort();
+
+const localeFiles = (directory: string, prefix: string, suffix: string): string[] =>
+  fs
+    .readdirSync(path.join(packageRoot, directory))
+    .filter((name) => name.startsWith(prefix) && name.endsWith(suffix) && name !== `${prefix}${suffix}`)
+    .map((name) => path.join(directory, name));
+
+describe('extension localization bundles', () => {
+  test('every runtime string bundle covers the English keys with matching placeholders', () => {
+    const english = readJson('l10n/bundle.l10n.json');
+    for (const file of localeFiles('l10n', 'bundle.l10n', '.json')) {
+      const translated = readJson(file);
+      for (const [key, source] of Object.entries(english)) {
+        const value = translated[key];
+        assert.equal(typeof value, 'string', `${file} is missing the key ${JSON.stringify(key)}`);
+        assert.deepEqual(
+          placeholders(value),
+          placeholders(source),
+          `${file} changes the placeholders of ${JSON.stringify(key)}`
+        );
+      }
+    }
+  });
+
+  test('every manifest bundle covers the English keys', () => {
+    const english = readJson('package.nls.json');
+    for (const file of localeFiles('.', 'package.nls', '.json')) {
+      const translated = readJson(file);
+      for (const key of Object.keys(english)) {
+        assert.equal(typeof translated[key], 'string', `${file} is missing the key ${key}`);
+      }
+    }
+  });
+});