- Added 'vi' (Vietnamese) to the list of supported app locales in i18n.ts.
- Updated locale definitions to include Vietnamese translations for various keys.
- Modified existing locale files (de-DE, en, es-419, es-ES, fr-FR, it-IT, ja-JP, ko-KR, pt-BR, pt-PT, ru-RU, zh-CN) to include Vietnamese translations for Vietnamese and ensure consistency.
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