feat(i18n): add Vietnamese language support

[0xSysR3ll]

Description

This PR adds the necessary keys to support Vietnamese language.

• Fixes Support Vietnamese display language #2403

How Has This Been Tested?

Screenshots / Logs (if applicable)

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• Translation keys pnpm i18n:extract
• Database migration (if required)

Summary by CodeRabbit

• New Features
  • Added Vietnamese (Tiếng Việt) as an available language option, enabling users to select Vietnamese for their interface and content localization.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f15d5e50-c83a-4a64-a714-10e51399778e

📥 Commits

Reviewing files that changed from the base of the PR and between 4d2b658 and 0b94ced.

📒 Files selected for processing (4)

• server/api/tvdb/interfaces.ts
• server/types/languages.d.ts
• src/context/LanguageContext.tsx
• src/pages/_app.tsx

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📝 Walkthrough

Walkthrough

Vietnamese language support is added across the application by introducing the vi locale in the type definitions, language mapping constants, available languages list, and translation file loader. No functional logic is modified; only configuration and language data are extended.

Changes

Cohort / File(s)	Summary
Type & Mapping Definitions server/types/languages.d.ts, server/api/tvdb/interfaces.ts	Updated AvailableLocale type to include 'vi' and added TMDB-to-TVDB locale mapping vi: vie for Vietnamese region support.
Language Configuration src/context/LanguageContext.tsx	Added Vietnamese entry to availableLanguages object with language code 'vi' and display name 'Tiếng Việt'.
Translation Loading src/pages/_app.tsx	Added dynamic import case for Vietnamese (vi) translation file (vi.json) in the locale data loader.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 With whispered "Xin chào" from the East,
Vietnamese voices join our feast!
From Hanoi's heart to distant shores,
Vi locale opens welcoming doors! 🌏

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Linked Issues check	❓ Inconclusive	The PR adds Vietnamese language infrastructure but the PR description indicates critical translation tasks remain incomplete (translations not extracted via pnpm i18n:extract).	Confirm that all Vietnamese translations have been properly added via pnpm i18n:extract before merging to fully address issue #2403's requirement for complete Vietnamese UI text support.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding Vietnamese language support to the internationalization system.
Out of Scope Changes check	✅ Passed	All changes directly support Vietnamese language addition: TMDB locale mapping, AvailableLocale type, language context entry, and locale loader case all appropriately scope to the objective.

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[0xSysR3ll]

Weird, Vietnamese was already available in Weblate but code was missing the keys

[fallenbagel]

Weird, Vietnamese was already available in Weblate but code was missing the keys

#2680

Once this is merged we can merge this pr