feat: add Farsi (fa) locale support
Add comprehensive Farsi translation for the webmail interface: - Create locales/fa/common.json with Farsi translations - Register 'fa' locale in i18n/routing.ts and i18n/request.ts - Add Iran flag component (FlagIR) to flag-icons.tsx - Add ف��رسی to language switcher dropdown - Add Farsi language name to English locale for language selector Translation covers login, sidebar, email viewer, composer, settings, notifications, calendar, contacts, errors, shortcuts, and more.
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