feat(i18n): wire locale switcher, verify translations, and add CI check

[legend4tech]

Description

This PR resolves the outstanding internationalization (i18n) issues by wiring up the locale switcher, fixing missing translations, and introducing CI safeguards to prevent future locale drift.

What's Changed

• Fixed English Fallthroughs: Audited es.json and tl.json and found 15 keys holding English copy (e.g. "Asset", "Liquidated", "Dashboard"). These have all been accurately translated to Spanish and Tagalog.
• Wired Locale Switcher: Connected the settings page language dropdown to next-intl navigation hooks. Changing the language now actively updates the URL locale segment (e.g., /en/settings -> /es/settings) and naturally persists the choice via cookies.
• Removed Legacy Notice: Removed the "Full i18n support is coming soon..." text from the settings page, as translations are now fully functional for English, Spanish, and Tagalog.
• Added CI Drift Protection:
  • Added scripts/check-locales.js to rigorously flatten and compare every JSON key against en.json.
  • Added the npm run check-locales script to package.json.
  • Introduced .github/workflows/ci.yml to automatically run this parity check on pushes and PRs to main, ensuring no keys are ever missed or orphaned during development.

Out of Scope

• Adding new locales beyond es and tl.
• RTL (Right-to-Left) layout support (a future implementation plan has been drafted separately).

Checklist

• Tested locale switcher locally (URL updates correctly).
• Verified exactly 108 translation keys exist in all three language files.
• Confirmed npm run check-locales passes without errors.
• Pushed CI workflow for GitHub Actions.

closes #7

[ogazboiz]

this is good work, the locale switcher actually works (reads locale from useParams, routes by swapping the locale segment, correct for next-intl localePrefix always), you dropped the fake fr/pt/hi languages so the switcher list (en/es/tl) now matches middleware.ts, the tl.json translations are filled in, check-locales.js passes, and the ci.yml is valid. one fix before merge:

1. prettier (the lint gate) fails on the 2 new files. run: npx prettier --write .github/workflows/ci.yml scripts/check-locales.js then commit.

heads up: the CI check you added only runs check-locales, not prettier/tsc, so it won't self-catch formatting, the repo npm run lint gate will. fix the prettier and i'll merge.

if you want to keep contributing, join us on Telegram: https://t.me/+DOylgFv1jyJlNzM0

[legend4tech]

this is good work, the locale switcher actually works (reads locale from useParams, routes by swapping the locale segment, correct for next-intl localePrefix always), you dropped the fake fr/pt/hi languages so the switcher list (en/es/tl) now matches middleware.ts, the tl.json translations are filled in, check-locales.js passes, and the ci.yml is valid. one fix before merge:

1. prettier (the lint gate) fails on the 2 new files. run: npx prettier --write .github/workflows/ci.yml scripts/check-locales.js then commit.

heads up: the CI check you added only runs check-locales, not prettier/tsc, so it won't self-catch formatting, the repo npm run lint gate will. fix the prettier and i'll merge.

if you want to keep contributing, join us on Telegram: https://t.me/+DOylgFv1jyJlNzM0

Done u can merge