Editor accepts a locale URL parameter, loads the corresponding
translation (or empty form for new locales), and exposes
addTranslation/setDefaultLocale/deleteTranslation actions. Tab bar
shows existing locales with default-locale star and a + dropdown
for missing locales.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Yutaka Kurosaki
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