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feat(web): set up i18n foundation with a language switcher #311

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feat(web): set up i18n foundation with a language switcher #311

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118 changes: 116 additions & 2 deletions apps/web/package-lock.json
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2 changes: 2 additions & 0 deletions apps/web/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -40,9 +40,11 @@
"axios": "^1.16.0",
"clsx": "^2.1.1",
"dompurify": "^3.2.7",
"i18next": "^24.2.3",
"lucide-react": "^0.563.0",
"react": "^19.2.0",
"react-dom": "^19.2.0",
"react-i18next": "^15.7.4",
"react-router-dom": "^7.13.0",
"recharts": "^3.7.0",
"tailwind-merge": "^3.4.0",
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34 changes: 34 additions & 0 deletions apps/web/src/components/LanguageSwitcher.tsx
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Original file line number Diff line number Diff line change
@@ -0,0 +1,34 @@
import { useTranslation } from 'react-i18next';
import { SUPPORTED_LANGUAGES, setLanguage, type LanguageCode } from '../i18n';
import { cn } from '../lib/utils';

interface LanguageSwitcherProps {
className?: string;
}

/**
* Compact UI-language selector (issue #32). Persists the choice to localStorage
* via setLanguage so it survives reloads and applies app-wide immediately.
*/
export function LanguageSwitcher({ className }: LanguageSwitcherProps) {
const { t, i18n } = useTranslation('common');
const current = i18n.resolvedLanguage ?? i18n.language;

return (
<label className={cn('inline-flex items-center gap-2 text-sm', className)}>
<span className="text-(--txt-tertiary)">{t('language')}</span>
<select
aria-label={t('language')}
value={current}
onChange={(e) => setLanguage(e.target.value as LanguageCode)}
className="rounded-(--radius-md) border border-(--border-subtle) bg-(--bg-surface-1) px-2 py-1 text-sm text-(--txt-primary) focus:outline-none focus:border-(--border-strong)"
>
{SUPPORTED_LANGUAGES.map((l) => (
<option key={l.code} value={l.code}>
{l.label}
</option>
))}
</select>
</label>
);
}
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