feat: Update legal text for user consent and data processing across multiple locales, ensuring clarity and compliance with regulations

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sebseb7
2026-03-25 10:59:10 +01:00
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# Internationalization (i18n)
This project uses [i18next](https://www.i18next.com/) with [react-i18next](https://react.i18next.com/). The setup works with both function components and class components (HOCs).
## Overview
- **Default language:** German (`de`), bundled at startup.
- **Other languages:** Loaded on demand when the user switches (see `loadLanguage` in `src/i18n/index.js`).
- **Persistence:** Language choice is stored in `sessionStorage` / `localStorage` (`i18nextLng`) via a custom detector in `src/i18n/index.js`.
- **HTML `lang`:** Updated when the language changes (see `LanguageProvider` in `src/i18n/withTranslation.js`).
- **Fallback:** `fallbackLng` is `de`.
### Product-facing behavior
- **Language switcher** — `src/components/LanguageSwitcher.js`: shows current language with flag, dropdown to change language, persists selection.
- **Translated areas** — Navigation, auth, cart, checkout, product UI, footer, profile, and more; legal pages use dedicated **`legal-*`** namespaces (long-form text).
## Layout
| Path | Role |
|------|------|
| `src/i18n/index.js` | Initializes i18n, registers namespaces, lazy-loads non-German locales |
| `src/i18n/withTranslation.js` | `LanguageProvider`, `withTranslation`, `withI18n`, `withLanguage` |
| `src/i18n/locales/<lang>/` | Per-language modules (`de`, `en`, …) |
Each language folder contains:
- **`index.js`** — Merges feature modules into the main **`translation`** namespace (shop UI: `navigation`, `cart`, `product`, …). Some legal content is also re-exported here under camelCase keys (e.g. `legalAgbDelivery`) for convenience; runtime legal pages use separate namespaces (see below).
- **One file per topic** — e.g. `cart.js`, `navigation.js`, `product.js` (not a single `translation.json`).
- **Legal bundles** — e.g. `legal-agb-delivery.js`, `legal-datenschutz-basic.js`, `legal-impressum.js`, registered as their **own i18next namespaces** in `src/i18n/index.js`.
## Namespaces
- **`translation`** (default) — Everything merged in `locales/<lang>/index.js`. Keys are dot paths such as `cart.addToCart` or `product.title`.
- **`legal-*`** — Long-form legal copy. Loaded the same way, but you select the namespace in `useTranslation('legal-impressum')` (or equivalent). Keys are relative to that namespace, e.g. `sections.operator.title`, not `legal-impressum.sections.operator.title`.
Default namespace is `translation`; omit the argument for shop UI:
```javascript
const { t } = useTranslation();
// same as useTranslation('translation')
```
Legal page example:
```javascript
const { t } = useTranslation('legal-impressum');
return t('title');
```
Multiple namespaces in one component:
```javascript
const { t: tDelivery } = useTranslation('legal-agb-delivery');
const { t: tPayment } = useTranslation('legal-agb-payment');
```
## Usage in components
### Function components
```javascript
import { useTranslation } from 'react-i18next';
const MyComponent = () => {
const { t } = useTranslation();
return <Typography>{t('navigation.home')}</Typography>;
};
```
### Class components — `withI18n` (translation + language context)
`withI18n` combines translation and language context. Use it when you need `t` and optionally `languageContext`:
```javascript
import { withI18n } from '../i18n/withTranslation.js';
class MyComponent extends Component {
render() {
const { t } = this.props;
return <Typography>{t('navigation.home')}</Typography>;
}
}
export default withI18n()(MyComponent);
```
### Class components — `withTranslation` + `withLanguage`
Some components only need `t` and `languageContext` from separate HOCs:
```javascript
import { withTranslation } from 'react-i18next';
import { withLanguage } from '../i18n/withTranslation.js';
export default withTranslation()(withLanguage(MyComponent));
```
Destructuring in `render`:
```javascript
const { t, title } = this.props;
t('product.new');
```
`this.props.t('…')` resolves against the default `translation` namespace.
### Language context (`changeLanguage`)
```javascript
import { withLanguage } from '../i18n/withTranslation.js';
class MyComponent extends Component {
render() {
const { languageContext } = this.props;
return (
<Button onClick={() => languageContext.changeLanguage('en')}>
English
</Button>
);
}
}
export default withLanguage(MyComponent);
```
Available language codes are defined on `LanguageProvider` (`allLanguages` in `withTranslation.js`); the switcher only offers languages that are loaded or loading.
## Key naming
- Use **dot notation** for nested objects in the JS exports: `product.inclVat`, `delivery.times.standard2to3Days`.
- File names in `locales/de/` map to **top-level segments** inside `index.js` (e.g. `cart.js``cart.*`). Keep new strings in the appropriate module and **export them from `index.js`** if you add a new file.
## Interpolation
i18next interpolation uses `{{name}}` in strings and an options object:
```javascript
t('product.weight', { weight: '1,2' });
```
```javascript
// locale string example: "Gewicht: {{weight}} kg"
```
## Language switching
`LanguageProvider` coordinates `i18n.changeLanguage` and lazy loading. Non-default languages are loaded via `loadLanguage` in `src/i18n/index.js`, which dynamic-imports the same file layout under `locales/<lang>/`.
## Adding or changing copy
1. Edit the right module under `src/i18n/locales/de/` (source of truth for structure).
2. Mirror changes in other languages under `src/i18n/locales/<lang>/` as needed, or use the projects translation tooling (`npm run translate`, etc. — see `translate-i18n.js` and `package.json` scripts).
3. For a **new top-level section**, add the module import and export in `locales/<lang>/index.js` for every language you ship.
### Example (new keys in an existing file)
`src/i18n/locales/de/cart.js`:
```javascript
export default {
// ...
newFeature: {
title: 'Neuer Titel',
description: 'Neue Beschreibung',
},
};
```
Use in code: `t('cart.newFeature.title')` (assuming the `cart` object is merged under `cart` in `index.js`).
## Adding a new language
1. Add a folder `src/i18n/locales/<code>/` with the same **file set** as German (at minimum `index.js` and every module `index.js` imports, plus all `legal-*.js` files registered in `src/i18n/index.js`).
2. Ensure `loadLanguage` in `src/i18n/index.js` can import that folder (pattern already uses `import(\`./locales/${language}/...\`)`).
3. Include the code in `allLanguages` (and any UI lists) in `withTranslation.js` / `LanguageSwitcher.js` as needed.
4. Clear the language cache logic if you add special cases (`languageCache` in `index.js`).
## Configuration notes
- **Detection:** Custom detector in `src/i18n/index.js` prefers session/localStorage, then defaults to `de` (browser language is not used for the initial default).
- **Debug:** i18next `debug` follows `NODE_ENV` (on in development).
- **Missing keys:** `saveMissing` can run in development (see `src/i18n/index.js`).
## SEO
- Document `lang` updates with language changes.
- You can extend the app with hreflang, localized routes, or metadata per language as needed.
## Best practices
1. **Keep structure parallel** across `locales/<lang>/` files.
2. **Prefer German (`de`) as the structural source**; keep `fallbackLng` aligned with your primary market.
3. **Use interpolation** for variable fragments: `t('key', { name: value })`.
4. **Test** critical flows after adding strings or languages.
## Translation coverage (high level)
Coverage varies by screen; shop flows, auth, cart, products, and legal pages have substantial strings. Remaining gaps are normal for a growing app—search for hard-coded German/English in components when polishing.
## Performance
- **German** is in the initial bundle.
- **Other languages** load on first switch (dynamic import), then stay cached in the i18n layer for the session.
## Browser support
Modern browsers with ES modules, `localStorage` / `sessionStorage`, and your supported React version.
---
## Key usage check (`scripts/check-i18n-keys.mjs`)
The check answers: *which keys defined for German (`src/i18n/locales/de`) appear to be unused in `src/`?*
Run:
```bash
npm run i18n:check-keys
# or
node scripts/check-i18n-keys.mjs
```
Machine-readable output:
```bash
node scripts/check-i18n-keys.mjs --json
```
### What the script detects
The script only understands **static** key strings:
- `t('cart.addToCart')`, `t("…")`
- `this.props.t('…')`, `props.t('…')`
- Aliases from `useTranslation('namespace')`, e.g. `const { t: tDelivery } = useTranslation('legal-agb-delivery');` then `tDelivery('deliveryTerms.1')`
- Destructuring `const { t } = this.props` / `props` for HOC-wrapped components
- Fully static template literals without interpolation: `` t(`some.key`) ``
It flattens locale objects the same way i18next does (leaf keys only).
### Embedded legal copy vs separate namespaces
Legal strings exist in two shapes:
1. **Separate namespace** (what pages use): `legal-agb-delivery` + key `deliveryTerms.1`.
2. **Embedded in `translation`**: `legalAgbDelivery.deliveryTerms.1` inside `locales/de/index.js`.
The script treats a key as used in the **embedded** `translation` tree when the matching **separate-namespace** key is used, so you do not see false “unused” duplicates for the same text.
### Dynamic keys (`t(\`…${x}…\`)`)
If the key is built at runtime, the static scan will not see it. The script includes **hard-coded expansions** for known patterns on:
- `src/pages/AGB.js`
- `src/pages/Datenschutz.js` (basic Datenschutz sections)
- `src/pages/Impressum.js`
If you add **new** dynamic patterns elsewhere, either:
- Prefer **static** keys where reasonable (`t('feature.section.title')` per section), or
- Extend `addKnownDynamicLegalKeys` (or equivalent) in `scripts/check-i18n-keys.mjs` so the checker knows which key paths can occur.
Other files may still be listed under “template literals in `t(...)`” when the script cannot prove all keys.
### Making new keys “count” for the checker
1. Call `t` with a **string literal** (or a template literal **without** `${…}`) as the first argument.
2. Use **`useTranslation('namespace')`** with a **string literal** namespace so aliases like `tFoo` map correctly.
3. For class components, keep **`const { t } = this.props`** (or `props`) so the script ties `t` to `translation`.
Avoid only referencing a key from non-`src` code (build scripts, server-only files): the checker only scans `src/` and skips `src/i18n/locales/**`.
### Interpreting results
- **Unused** — No static (and no expanded dynamic) reference found; may still be dead copy, or only used via variables/dynamic templates.
- **Used but not in locale files** — A reference in code does not match any defined German key (typo or missing `de` entry).
The report is **best-effort**; use it to find obvious dead strings and drift, not as a formal guarantee.

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#!/usr/bin/env node
/**
* Reports which keys from src/i18n/locales/de are referenced in application code.
*
* - Loads the same namespaces as src/i18n/index.js (translation bundle + legal-* bundles).
* - Parses static t("...") / t('...') calls and maps useTranslation() aliases to namespaces.
* - Legal text is duplicated: separate namespaces (e.g. legal-agb-delivery) AND embedded under
* translation (legalAgbDelivery.*). When a separate-namespace key is used, the embedded
* translation::* copy is treated as used too.
* - Known dynamic patterns from AGB.js, Datenschutz.js, Impressum.js are expanded so those
* keys are not falsely listed as unused.
*
* Usage: node scripts/check-i18n-keys.mjs
* node scripts/check-i18n-keys.mjs --json
*/
import { readFile, readdir } from 'node:fs/promises';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
const __dirname = path.dirname(fileURLToPath(import.meta.url));
const ROOT = path.join(__dirname, '..');
const SRC = path.join(ROOT, 'src');
const LOCALE_DE = path.join(SRC, 'i18n', 'locales', 'de');
const SEPARATE_NAMESPACES = [
'legal-agb-delivery',
'legal-agb-payment',
'legal-agb-consumer',
'legal-datenschutz-basic',
'legal-datenschutz-customer',
'legal-datenschutz-google-orders',
'legal-datenschutz-newsletter',
'legal-datenschutz-chatbot',
'legal-datenschutz-push',
'legal-datenschutz-cookies-payment',
'legal-datenschutz-rights',
'legal-impressum',
'legal-widerruf',
'legal-batterie',
];
/** Separate i18n namespace -> key prefix inside translation bundle (locales/de/index.js). */
const NS_TO_EMBEDDED_PREFIX = {
'legal-agb-delivery': 'legalAgbDelivery',
'legal-agb-payment': 'legalAgbPayment',
'legal-agb-consumer': 'legalAgbConsumer',
'legal-datenschutz-basic': 'legalDatenschutzBasic',
'legal-datenschutz-customer': 'legalDatenschutzCustomer',
'legal-datenschutz-google-orders': 'legalDatenschutzGoogleOrders',
'legal-datenschutz-newsletter': 'legalDatenschutzNewsletter',
'legal-datenschutz-chatbot': 'legalDatenschutzChatbot',
'legal-datenschutz-cookies-payment': 'legalDatenschutzCookiesPayment',
'legal-datenschutz-rights': 'legalDatenschutzRights',
};
/**
* Keys reached only via t(`…${var}…`) in a few pages — expand so they count as used.
*/
function addKnownDynamicLegalKeys(used) {
for (let n = 1; n <= 14; n++) {
used.add(keySet('legal-agb-delivery', `deliveryTerms.${n}`));
}
for (const n of [1, 2, 3, 5, 6, 7, 8]) {
used.add(keySet('legal-agb-consumer', `distanceSelling.sections.${n}.title`));
used.add(keySet('legal-agb-consumer', `distanceSelling.sections.${n}.content`));
}
for (const section of ['informationDeletion', 'serverLogfiles']) {
used.add(keySet('legal-datenschutz-basic', `sections.${section}.title`));
used.add(keySet('legal-datenschutz-basic', `sections.${section}.content`));
}
for (const section of ['operator', 'contact', 'vatId', 'disclaimer', 'copyright']) {
used.add(keySet('legal-impressum', `sections.${section}.title`));
used.add(keySet('legal-impressum', `sections.${section}.content`));
}
}
/** If legal-agb-delivery::foo is used, translation::legalAgbDelivery.foo is the same strings. */
function propagateEmbeddedCopies(used) {
const additions = [];
for (const entry of used) {
const sep = entry.indexOf('::');
if (sep === -1) continue;
const ns = entry.slice(0, sep);
const keyPath = entry.slice(sep + 2);
const prefix = NS_TO_EMBEDDED_PREFIX[ns];
if (!prefix) continue;
additions.push(keySet('translation', `${prefix}.${keyPath}`));
}
for (const a of additions) used.add(a);
}
function flattenLeaves(obj, prefix = '') {
const keys = [];
if (obj === null || obj === undefined) return keys;
if (typeof obj !== 'object' || Array.isArray(obj)) {
if (prefix) keys.push(prefix);
return keys;
}
const entries = Object.entries(obj);
if (entries.length === 0 && prefix) keys.push(prefix);
for (const [k, v] of entries) {
const next = prefix ? `${prefix}.${k}` : k;
if (v !== null && typeof v === 'object' && !Array.isArray(v)) {
keys.push(...flattenLeaves(v, next));
} else {
keys.push(next);
}
}
return keys;
}
function keySet(ns, keyPath) {
return `${ns}::${keyPath}`;
}
async function loadDefinedKeys() {
const translationMod = await import(
pathToFileUrl(path.join(LOCALE_DE, 'index.js'))
);
const translation = translationMod.default;
const defined = new Map();
defined.set('translation', new Set(flattenLeaves(translation)));
for (const ns of SEPARATE_NAMESPACES) {
const mod = await import(pathToFileUrl(path.join(LOCALE_DE, `${ns}.js`)));
defined.set(ns, new Set(flattenLeaves(mod.default)));
}
return defined;
}
function pathToFileUrl(p) {
const normalized = path.resolve(p);
return new URL(`file://${normalized}`).href;
}
async function collectSourceFiles(dir, out = []) {
const entries = await readdir(dir, { withFileTypes: true });
for (const e of entries) {
const full = path.join(dir, e.name);
if (e.isDirectory()) {
if (full.includes(`${path.sep}i18n${path.sep}locales`)) continue;
await collectSourceFiles(full, out);
} else if (/\.(jsx?|tsx?)$/.test(e.name)) {
out.push(full);
}
}
return out;
}
/**
* Per file: map translation function alias -> i18next namespace.
*/
function buildAliasMap(source) {
const map = new Map();
const named = /const\s*\{\s*t:\s*(\w+)\s*\}\s*=\s*useTranslation\s*\(\s*['"]([^'"]+)['"]\s*\)/g;
let m;
while ((m = named.exec(source))) {
map.set(m[1], m[2]);
}
const tWithNs =
/const\s*\{\s*t\s*\}\s*=\s*useTranslation\s*\(\s*['"]([^'"]+)['"]\s*\)/g;
while ((m = tWithNs.exec(source))) {
map.set('t', m[1]);
}
const tDefault = /const\s*\{\s*t\s*\}\s*=\s*useTranslation\s*\(\s*\)/g;
while (tDefault.exec(source)) {
map.set('t', 'translation');
}
// withTranslation HOC: t comes from props (any position in destructuring)
const tFromThisProps =
/const\s*\{[^}]*\bt(?:\s*:\s*(\w+))?\b[^}]*\}\s*=\s*this\.props/;
const mProps = tFromThisProps.exec(source);
if (mProps) {
map.set(mProps[1] || 't', 'translation');
}
const tFromProps =
/const\s*\{[^}]*\bt(?:\s*:\s*(\w+))?\b[^}]*\}\s*=\s*props\b/;
const mP = tFromProps.exec(source);
if (mP) {
map.set(mP[1] || 't', 'translation');
}
if (!map.has('t')) {
map.set('t', 'translation');
}
return map;
}
function escapeRe(s) {
return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
}
/**
* Extract static keys from t-like calls for known aliases.
*/
function extractUsedKeysFromSource(source, filePath) {
const aliasMap = buildAliasMap(source);
const used = new Set();
const dynamicHints = [];
let m;
const propsT =
/(?:this\.props\.t|props\.t)\(\s*['"]([^'"]+)['"]/g;
while ((m = propsT.exec(source))) {
used.add(keySet('translation', m[1]));
}
for (const [alias, ns] of aliasMap) {
const re = new RegExp(
`\\b${escapeRe(alias)}\\(\\s*['"]([^'"]+)['"]`,
'g'
);
while ((m = re.exec(source))) {
used.add(keySet(ns, m[1]));
}
}
const tplStatic = /\b(\w+)\(\s*`([^`${}]*)`\s*\)/g;
while ((m = tplStatic.exec(source))) {
const alias = m[1];
const key = m[2].trim();
if (!key || !aliasMap.has(alias)) continue;
if (/^[a-zA-Z][a-zA-Z0-9_.]*$/.test(key)) {
used.add(keySet(aliasMap.get(alias), key));
}
}
if (
/(?:this\.props\.t|props\.t|\bt\w*)\(\s*`[^`]*\$\{/.test(source)
) {
dynamicHints.push(filePath);
}
return { used, dynamicHints };
}
function mergeSets(into, from) {
for (const x of from) into.add(x);
}
async function main() {
const jsonOut = process.argv.includes('--json');
const defined = await loadDefinedKeys();
const files = await collectSourceFiles(SRC);
const allUsed = new Set();
const dynamicFiles = new Set();
for (const file of files) {
const source = await readFile(file, 'utf8');
const { used, dynamicHints } = extractUsedKeysFromSource(source, file);
mergeSets(allUsed, used);
if (dynamicHints.length) dynamicFiles.add(file);
}
addKnownDynamicLegalKeys(allUsed);
propagateEmbeddedCopies(allUsed);
const unusedByNs = new Map();
let totalDefined = 0;
let totalUnused = 0;
for (const [ns, keys] of defined) {
const unused = [];
for (const k of keys) {
totalDefined++;
const full = keySet(ns, k);
if (!allUsed.has(full)) {
unused.push(k);
totalUnused++;
}
}
if (unused.length) unusedByNs.set(ns, unused.sort());
}
const orphans = new Set();
for (const u of allUsed) {
const [ns, keyPath] = u.split('::');
const set = defined.get(ns);
if (!set || !set.has(keyPath)) {
orphans.add(u);
}
}
if (jsonOut) {
console.log(
JSON.stringify(
{
totalDefined,
totalUsed: allUsed.size,
totalUnused,
unusedByNamespace: Object.fromEntries(unusedByNs),
usedButNotDefined: [...orphans].sort(),
filesWithLikelyDynamicT: [...dynamicFiles].map((f) =>
path.relative(ROOT, f)
),
},
null,
2
)
);
return;
}
console.log('i18n key usage (locale: de)\n');
console.log(
'Legal strings exist twice: separate namespaces (AGB, Datenschutz, …) and embedded copies'
);
console.log(
'under translation (legalAgbDelivery.*, …). The latter are marked used when the former are.\n'
);
console.log(`Defined keys (all namespaces): ${totalDefined}`);
console.log(`References after static scan + known dynamic legal patterns: ${allUsed.size}`);
console.log(`Unused (best-effort): ${totalUnused}`);
console.log(`Used but not in locale files: ${orphans.size}\n`);
const stillDynamic = [...dynamicFiles].filter(
(f) =>
![
'pages/AGB.js',
'pages/Datenschutz.js',
'pages/Impressum.js',
].includes(path.relative(SRC, f).replace(/\\/g, '/'))
);
if (stillDynamic.length) {
console.log(
'Other files with t(`…${…}…`) (may still hide unused keys — not expanded):'
);
for (const f of stillDynamic.sort()) {
console.log(` ${path.relative(ROOT, f)}`);
}
console.log('');
}
for (const [ns, keys] of [...unusedByNs.entries()].sort((a, b) =>
a[0].localeCompare(b[0])
)) {
console.log(`--- ${ns} (${keys.length} unused) ---`);
for (const k of keys) {
console.log(` ${k}`);
}
console.log('');
}
if (orphans.size) {
console.log('--- Referenced in code but missing from de locale ---');
for (const o of [...orphans].sort()) {
console.log(` ${o.replace('::', ' / ')}`);
}
}
console.log(
'\nNote: Keys built from arbitrary variables or unknown dynamic templates may still look unused.'
);
}
main().catch((err) => {
console.error(err);
process.exit(1);
});

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/**
* POST client errors to /api/telemetry/js-errors (shop API).
* Uses same-origin relative URL so the dev-server proxy forwards to the backend.
*/
const TELEMETRY_PATH = '/api/telemetry/js-errors';
function send(payload) {
fetch(TELEMETRY_PATH, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload),
}).catch(() => {});
}
/**
* Register global listeners once. Safe to call in browser only.
*/
export function installJsErrorTelemetry() {
if (typeof window === 'undefined') {
return;
}
window.addEventListener('error', (event) => {
send({
message: event.message || 'Error',
name: event.error?.name,
filename: event.filename,
lineno: event.lineno,
colno: event.colno,
url: window.location.href,
stack: event.error && event.error.stack,
});
});
window.addEventListener('unhandledrejection', (event) => {
const reason = event.reason;
send({
message:
reason && typeof reason.message === 'string'
? reason.message
: String(reason),
name: reason && reason.name,
stack: reason && reason.stack,
url: window.location.href,
context: { type: 'unhandledrejection' },
});
});
}