Replace the plain content-language <Select> in the brand form with a
searchable LanguagePicker combobox (Popover + Command), matching the
FontPicker. i18n the combobox placeholder/search/empty strings across all
15 locales.
Switch the UI language via a full page reload instead of client-side dir
syncing, so the server-rendered <html dir> flips LTR<->RTL correctly
without a manual refresh.
Add full lang/ translations for fr, de, it, nl, pl, el, ja, ko, zh, ru,
tr, and ar — all 23 base files each, with identical key trees to lang/en,
preserved :placeholders and plural forms, and native product terminology.
