Add Arabic language with full RTL support#10906
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Register Arabic ('ar') as a supported UI language and implement full
right-to-left layout mirroring — the platform's first RTL language.
Language registration:
- Add 'ar' to enabled-language lists (dev/prod + desktop platform.ts,
branding.json) and the settings language dropdown (العربية).
- Add the "Arabic" label string to the ui plugin + all locale files.
Translation:
- Add ar.json for all 66 plugins (~4000 strings, Modern Standard Arabic),
preserving keys and ICU placeholders. Validated against en parity with
the platform's intl-messageformat parser.
- Extend the official lang parity test (testUtils) to cover 'ar'.
RTL:
- Theme.svelte sets document dir=rtl for RTL languages, live on switch.
- scripts/rtl-codemod.mjs rewrites 971 physical CSS declarations across
292 files to logical properties (margin/padding/border/inset/text-align/
float) — identical to physical in LTR, so no LTR regression.
- Chevron mirrors horizontal carets; _rtl.scss keeps code/mono LTR.
Typography:
- Bundle IBM Plex Sans Arabic (matches the IBM Plex UI family) and append
it to the font stack so Latin and Arabic glyphs resolve per-glyph.
Tooling:
- scripts/translate-arabic.mjs (Claude API) for reproducible re-translation.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Nexeon-Ai <205628096+Nexeon-Ai@users.noreply.github.com>
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Summary
Adds Arabic (
ar) as a supported UI language and implements full right-to-left (RTL) layout mirroring — the platform's first RTL locale.Language registration
aradded to the enabled-language lists (dev/prod/src/platform.ts,desktop/src/ui/platform.ts,dev/prod/public/branding.json) and the settings language dropdown (packages/ui/.../SettingsPopup.svelte, label العربية).Arabiclabel string added to theuiplugin and every existing locale file.Translations
lang/ar.jsonadded for all 66 asset plugins (~4,000 strings) in Modern Standard Arabic, preserving keys and ICU placeholders.enparity with the platform's ownintl-messageformatparser (0 ICU-argument mismatches, 0 parse failures).'ar'added to the shared locale parity test (testUtils.ts) so CI guards Arabic parity; alllang.test.tspass.RTL
packages/theme/src/Theme.sveltesetsdocument.documentElement.dir = 'rtl'for RTL languages, live on language switch.margin/padding/border/inset/text-align/float→ inline-logical). These are identical to physical properties under LTR, so there is no LTR regression, and the.ml-*/.mr-*spacing utilities now mirror automatically.Chevroncarets mirror;_rtl.scsskeeps code/mono content LTR inside an RTL document.Typography
Verification
rush install+ fullrush build(all packages) pass.Notes for maintainers
scripts/(rtl-codemod.mjs,translate-arabic.mjs) is reproducible and reversible; can be dropped from the PR if you'd prefer the result-only diff.