* Add localization for 16 new languages
Add translations for all 637 UI string keys and 3 InfoPlist keys in:
ar, bs, da, de, es, fr, it, ko, nb, pl, pt-BR, ru, th, tr, zh-Hans, zh-Hant
Update AppLanguage enum and knownRegions to include all 18 languages.
Total supported languages: en, ja + 16 new = 18.
* Reorder languages: English first, rest alphabetical, explicit display names
Use "Chinese Simplified" / "Chinese Traditional" naming. Show native script
with English name in parentheses for non-Latin languages.
* Add Chinese native characters to language display names
* Delay language restart dialog until picker dropdown closes
* Fix Arabic bidi rendering in language picker with LTR mark
* Defer AppleLanguages write to app launch, fix picker animation lag
Writing AppleLanguages to UserDefaults triggers synchronous locale
recalculation on the main thread, causing the picker dropdown dismiss
animation to stutter. Since a restart is already required, move the
AppleLanguages write to init() on next launch instead of onChange.
* Fix reset path and add apply() back to delayed onChange
- resetAllSettings() now calls LanguageSettings.apply(.system) and
shows restart alert if language was changed from launch value
- onChange also calls apply() inside the 0.3s delay block, so
AppleLanguages is set before restart (avoids two-restart issue)
- init() still calls apply() as belt-and-suspenders for launch
* Fix deferred alert race: re-check current language in closure
If user changes language then changes back within 0.3s, the stale
closure would fire with the old value. Now reads current appLanguage
inside the closure instead of capturing newValue.
* Fix Spanish and Danish translations: restore missing diacritics
Spanish was missing all áéíóúñ characters (now 315 diacritics).
Danish was missing all æøå characters (now 401 diacritics).
Both languages fully retranslated with correct orthography.
* Fix reset restart alert: compare new value against launch language
Was comparing previousLanguage against languageAtLaunch, which would
miss the case where user launched in Spanish and reset to System
(Spanish != Spanish = false, so no alert). Now compares the new
appLanguage (system) against languageAtLaunch.
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