Complete macOS localization parity and validate plural catalogs

.github/workflows/ci.yml

@@ -159,6 +159,12 @@ jobs:
       - name: Validate Python test harness syntax
         run: git ls-files 'tests/*.py' 'tests_v2/*.py' 'scripts/*.py' | xargs python3 -m py_compile
 
+      - name: Test macOS localization catalog tooling
+        run: python3 tests/test_localization_catalog.py
+
+      - name: Validate macOS localization parity
+        run: python3 scripts/localization_catalog.py check
+
       - name: Validate cmux-cloud-vm skill covers the vm CLI
         run: python3 tests/test_cloud_vm_skill_coverage.py
 

CLAUDE.md

@@ -131,7 +131,7 @@ Each of these has full detail in the skill named in parentheses.
 - **Terminal find layering** (`cmux-debugging`): `SurfaceSearchOverlay` mounts from `GhosttySurfaceScrollView` in `Sources/GhosttyTerminalView.swift` (AppKit portal layer), never from SwiftUI panel containers such as `Sources/Panels/TerminalPanelView.swift`. Portal-hosted terminal views can sit above SwiftUI during split/workspace churn.
 - **Custom UTTypes** for drag-and-drop must be declared in `Resources/Info.plist` under `UTExportedTypeDeclarations` (e.g. `com.splittabbar.tabtransfer`, `com.cmux.sidebar-tab-reorder`).
 - **Submodule safety** (`cmux-ghostty`): push the submodule commit to its remote `main` before committing the pointer in the parent repo. Never commit on a detached HEAD. Verify with `git merge-base --is-ancestor HEAD origin/main`.
-- **Localize every user-facing string** (`cmux-localization`): `String(localized:)` with keys in `Resources/Localizable.xcstrings`, plus every web message catalog (`web/messages/en.json`, `web/messages/ja.json`). A localization audit is required for any UI, Settings, menu, schema, docs, or help-text change, and the handoff must state what was audited.
+- **Localize every user-facing string** (`cmux-localization`): `String(localized:)` with keys in `Resources/Localizable.xcstrings`, plus every web message catalog (`web/messages/en.json`, `web/messages/ja.json`). The supported macOS app locales are English, German, French, Arabic, Spanish, Traditional Chinese, Simplified Chinese, Korean, and Japanese (`en`, `de`, `fr`, `ar`, `es`, `zh-Hant`, `zh-Hans`, `ko`, `ja`). A localization audit is required for any UI, Settings, menu, schema, docs, or help-text change, and the handoff must state what was audited.
 - **Shortcut policy** (`cmux-keyboard-shortcuts`): every new cmux-owned shortcut goes in `KeyboardShortcutSettings`, is editable in Settings, is supported in `~/.config/cmux/cmux.json`, and is documented.
 - **Test wiring** (`cmux-testing`): a `.swift` file in `cmuxTests/` without a `PBXFileReference` + `PBXSourcesBuildPhase` entry is silently skipped, and both `xcodebuild test` and bot reviews pass with "Executed 0 tests". `workflow-guard-tests` runs `./scripts/lint-pbxproj-test-wiring.sh` to catch it.
 - **SPM package groups** (`cmux-architecture`): packages live under `Packages/{Shared,iOS,macOS}/<pkg>` and the workspace mirrors that folder shape. To move one, `git mv` the directory then `python3 scripts/check-workspace-package-groups.py --write`. Never hand-edit workspace group membership.

CLI/CMUXCLI+CoderouterPassthrough.swift

@@ -140,7 +140,7 @@ extension CMUXCLI {
             throw Self.coderouterUnavailable(String(
                 format: Self.localizedPassthroughString(
                     "cli.coderouter.bootstrap.installedNotFound",
-                    defaultValue: "The CodeRouter installer finished, but no CodeRouter CLI was found in %@. Add its bin directory to PATH and retry."
+                    defaultValue: "The CodeRouter installer finished, but its command could not be found in %@. Check the installation and try again."
                 ),
                 binDirectory.path
             ))

CLI/CMUXCLI+ExecutableResolution.swift

@@ -14,7 +14,7 @@ extension CMUXCLI {
     func missingProviderExecutableMessage(displayName: String, executableName: String) -> String {
         let format = String(
             localized: "agentSession.error.missingProviderExecutable",
-            defaultValue: "%@ was not found. Install it and make sure \"%@\" is available on PATH."
+            defaultValue: "%@ was not found. Install it and make sure \"%@\" can be run from your terminal."
         )
         return String(format: format, displayName, executableName)
     }

Packages/Shared/CmuxAuthRuntime/Tests/CmuxAuthRuntimeTests/PushRegistrationServiceTests.swift

@@ -1632,15 +1632,11 @@ actor RetryDelayRecorder {
             await PushRegistrationURLProtocol.script.requests.map(\.httpMethod)
                 == ["DELETE"]
         )
+        // Join the service's disable reconciliation task. Request observation
+        // only proves that DELETE started; the actor may still be committing
+        // the durable tombstone removal when the URL protocol records it.
+        await service.applyEnabledIntent(false, generation: 1)
         let reopenedStore = try PendingUnregisterStore(databaseURL: storeURL)
-        // A request being recorded precedes URLSession completion and the
-        // durable DELETE commit; scheduler turns are not a completion signal.
-        let clock = ContinuousClock()
-        let deadline = clock.now.advanced(by: .seconds(1))
-        while !reopenedStore.batch(accountID: "account-a", limit: 2).isEmpty,
-              clock.now < deadline {
-            try await clock.sleep(for: .milliseconds(1))
-        }
         #expect(reopenedStore.batch(accountID: "account-a", limit: 2).isEmpty)
     }
 

Packages/macOS/CmuxBrowser/Sources/CmuxBrowser/DiffViewer/CmuxDiffViewerSessionError.swift

@@ -35,7 +35,7 @@ public enum CmuxDiffViewerSessionError: Int, Equatable, Error, LocalizedError, S
         case .invalidToken:
             String(
                 localized: "diffViewer.error.invalidToken",
-                defaultValue: "Invalid diff viewer token",
+                defaultValue: "Could not open the diff viewer. Try again.",
                 bundle: .module
             )
         case .emptyAllowlist:
@@ -71,13 +71,13 @@ public enum CmuxDiffViewerSessionError: Int, Equatable, Error, LocalizedError, S
         case .invalidManifest:
             String(
                 localized: "diffViewer.error.invalidManifest",
-                defaultValue: "Invalid diff viewer manifest",
+                defaultValue: "Could not load the diff viewer. Try again.",
                 bundle: .module
             )
         case .manifestTooLarge:
             String(
                 localized: "diffViewer.error.manifestTooLarge",
-                defaultValue: "Diff viewer manifest is too large",
+                defaultValue: "The diff is too large to display. Try opening fewer files.",
                 bundle: .module
             )
         case .unsafeTrustedRoot: