Internationalization and localization patterns. Detecting hardcoded strings, managing translations, locale files, RTL support.
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Internationalization (i18n) and Localization (L10n) best practices.
| Term | Meaning |
|---|---|
| i18n | Internationalization - making app translatable |
| L10n | Localization - actual translations |
| Locale | Language + Region (en-US, tr-TR) |
| RTL | Right-to-left languages (Arabic, Hebrew) |
| Project Type | i18n Needed? |
|---|---|
| Public web app | ✅ Yes |
| SaaS product | ✅ Yes |
| Internal tool | ⚠️ Maybe |
| Single-region app | ⚠️ Consider future |
| Personal project | ❌ Optional |
import { useTranslation } from 'react-i18next';
function Welcome() {
const { t } = useTranslation();
return <h1>{t('welcome.title')}</h1>;
}
import { useTranslations } from 'next-intl';
export default function Page() {
const t = useTranslations('Home');
return <h1>{t('title')}</h1>;
}
from gettext import gettext as _
print(_("Welcome to our app"))
locales/
├── en/
│ ├── common.json
│ ├── auth.json
│ └── errors.json
├── tr/
│ ├── common.json
│ ├── auth.json
│ └── errors.json
└── ar/ # RTL
└── ...
| Issue | Solution |
|---|---|
| Missing translation | Fallback to default language |
| Hardcoded strings | Use linter/checker script |
| Date format | Use Intl.DateTimeFormat |
| Number format | Use Intl.NumberFormat |
| Pluralization | Use ICU message format |
/* CSS Logical Properties */
.container {
margin-inline-start: 1rem; /* Not margin-left */
padding-inline-end: 1rem; /* Not padding-right */
}
[dir="rtl"] .icon {
transform: scaleX(-1);
}
Before shipping:
| Script | Purpose | Command |
|---|---|---|
scripts/i18n_checker.py | Detect hardcoded strings & missing translations | python scripts/i18n_checker.py <project_path> |
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