feat: Vuetify component translations

[pedrolamas]

Wires Vuetify's own component translations to the Fluidd language setting, and fixes browser locale detection along the way.

Vuetify i18n

• Vuetify keeps a separate string table for what its components render on their own — the v-data-table footer, pagination and sort aria-labels, the v-file-input counter. No locales were registered, so these stayed english in every language.
• Registers a translation for each language Fluidd ships, mapping the Fluidd locale codes onto Vuetify's (zh-CN → zh-Hans, zh-HK → zh-Hant, pt_BR → pt).
• Tamil has no Vuetify translation and stays on the english fallback.
• Types the vuetify/lib/locale/* module shim, which otherwise resolved as any.

Browser locale detection

• getStartingLocale stripped the region before matching, so a browser set to zh-CN resolved to zh — not a supported code — and fell back to english. Chinese users got english by default despite both translations shipping.
• It also only read the first navigator preference, so ['nb-NO', 'de-DE'] gave english rather than german.
• Navigator locales are now walked in preference order, matching the full code before the language alone.

Locale loading

• loadLocaleMessagesAsync now leans on i18n.availableLocales instead of tracking loaded locales in a parallel array, collapsing three branches into one.
• Called with no locale, it resolves the browser default itself, so callers no longer reach for getStartingLocale.
• Load failures log through consola rather than being swallowed.
• Waits.onLoadLanguage moves into a finally — a failed load previously stranded it — and now drives the language selector's loading state, which nothing had been reading.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Hooks Vuetify’s built-in component locale strings (data table footer/pagination, aria labels, file input counter, etc.) into Fluidd’s locale flow, and improves browser-locale resolution so the initial language selection better matches supported locales.

Changes:

• Add async Vuetify-locale loading (loadVuetifyLocaleAsync) and call it during config/onLocaleChange.
• Fix getStartingLocale to prefer full locale codes and walk navigator preferences in order; simplify locale async loading using i18n.availableLocales and add error logging via consola.
• Add unit tests for locale detection and wire the language selector loading state to Waits.onLoadLanguage.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/typings/vuetify.d.ts	Adds typing shim for vuetify/lib/locale/* imports.
src/store/config/actions.ts	Drives both VueI18n and Vuetify locale loading under onLocaleChange, with wait cleanup in finally.
src/plugins/vuetify.ts	Introduces Vuetify locale import map + loadVuetifyLocaleAsync.
src/plugins/i18n.ts	Improves starting-locale detection + simplifies async locale loading + logs load failures via consola.
src/plugins/tests/i18n.spec.ts	Adds tests covering locale matching and fallback behavior.
src/components/settings/GeneralSettings.vue	Shows language selector loading state via Waits.onLoadLanguage.
docs/docs/features/localization.md	Updates localization docs copy (Weblate note).
docs/docs/development.md	Documents Vuetify component translation behavior and mapping.
AGENTS.md	Documents the Vuetify locale map/loader behavior for agents/contributors.

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