Localize strings

Every user-facing string ships translated in seven locales. The catalog is version-controlled JSON and LocalizationCatalogTests pins full coverage — an English-only key fails the suite, it does not silently ship.

1. Use the localized form in code

User-facing text is String(localized: "…"); enum display names localize too. A bare literal in UI code ships untranslated — wrap it.

2. Add the catalog entries

Edit BetterCmdTab/Localizable.xcstrings directly (it is JSON). For each new key add translations for all of: de, es, fr, ja, pl, ru, zh-Hans. Copy the exact JSON shape of a neighboring entry, keep keys sorted where the surrounding file is sorted, and keep format specifiers (%@, %d, …) identical across every locale — specifier drift is a test failure. Remove catalog entries whose code key was deleted.

Info.plist strings live in BetterCmdTab/InfoPlist.xcstrings and the same suite covers them, with two extra rules.

Key a usage description by its plist key name (NSAppleEventsUsageDescription), not by its English value — the value form compiles fine and never resolves at runtime. Document-type names (CFBundleTypeName, UTTypeDescription) are the exception: those are keyed by value.

Every key in this catalog also needs an explicit en entry. A key-named one has no other source of English: without it Xcode emits the key as its own value and the prompt reads NSAppleEventsUsageDescription. For a value-keyed one it is redundant, but the test requires it uniformly.

Keep that en value byte-identical to its source — the INFOPLIST_KEY_* build setting in project.pbxproj (both configurations) for key-named entries, BetterCmdTab/Info.plist for document-type names. en.lproj/InfoPlist.strings overrides Info.plist, so editing only the build setting changes nothing.

3. Verify

xcodebuild -scheme "BetterCmdTab Debug" -destination 'platform=macOS' test \
  -only-testing:BetterCmdTabTests/LocalizationCatalogTests

Complete when: the suite passes with the new keys present in all seven locales.