feat(i18n): implement i18n framework with language detection

[yashhhguptaaa]

• Add language detection (browser + localStorage)
• Add setLang function for runtime language switching
• Extract 1527 translatable strings to en.json
• Implement loader with English fallback for missing translations
• Add /locales alias in Vite config for clean imports

Closes #519

---

Summary by cubic

Add a shared i18n framework with browser/localStorage language detection, runtime language switching, and English fallback. Wired both apps to lazy-load locale files via a Vite /locales alias. Closes #519.

• New Features

  • New i18n provider with SUPPORTED_LANGUAGES (en, fr), DEFAULT_LANG, and detectLanguage() (localStorage → browser → default).
  • Runtime switching via setLang; useTranslate now returns { lang, setLang, __ }.
  • Loader merges selected language over English for safe fallback.
  • Extracted ~1.5k strings to packages/i18n/locales/en.json.
  • Barrel export at @probo/i18n; both apps now use it and a dynamic loader (import.meta.glob).
  • Added /locales alias in Vite for clean JSON imports.

• Migration

  • Add new locales at packages/i18n/locales/.json (keys match en.json); missing keys fall back to English.
  • Remove hardcoded lang prop; call useTranslate().setLang('en' | 'fr') to switch at runtime.
  • Ensure app builds include the /locales alias (already added here).

^{Written for commit 6af3f3c. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 8 files

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="packages/i18n/locales/en.json">

<violation number="1" location="packages/i18n/locales/en.json:98">
P3: Typo: space before question mark. English typography does not use a space before punctuation marks. This appears to be a copy-paste from French text or a typo.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P3: Typo: space before question mark. English typography does not use a space before punctuation marks. This appears to be a copy-paste from French text or a typo.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At packages/i18n/locales/en.json, line 98:

<comment>Typo: space before question mark. English typography does not use a space before punctuation marks. This appears to be a copy-paste from French text or a typo.</comment>

<file context>
@@ -0,0 +1,1529 @@
+  &quot;Anguilla&quot;: &quot;Anguilla&quot;,
+  &quot;Antarctica&quot;: &quot;Antarctica&quot;,
+  &quot;Antigua and Barbuda&quot;: &quot;Antigua and Barbuda&quot;,
+  &quot;Are you sure ?&quot;: &quot;Are you sure ?&quot;,
+  &quot;Are you sure you want to delete the NDA file?&quot;: &quot;Are you sure you want to delete the NDA file?&quot;,
+  &quot;Are you sure you want to delete the invitation for %s?&quot;: &quot;Are you sure you want to delete the invitation for %s?&quot;,
</file context>

[yashhhguptaaa]

@cubic-dev-ai

This is fine and expected. The string is only being used as the country name.

[yashhhguptaaa]

@SachaProbo @gearnode, please take a look at this PR at your convenience.