first commit

app/services/i18n.py

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+import json
+from functools import lru_cache
+from pathlib import Path
+
+from flask import current_app, session
+from flask_login import current_user
+
+
+@lru_cache(maxsize=8)
+def load_language(language: str) -> dict:
+    base = Path(__file__).resolve().parent.parent / 'static' / 'i18n'
+    file_path = base / f'{language}.json'
+    if not file_path.exists():
+        file_path = base / 'pl.json'
+    return json.loads(file_path.read_text(encoding='utf-8'))
+
+
+def get_locale() -> str:
+    if getattr(current_user, 'is_authenticated', False):
+        return current_user.language or current_app.config['DEFAULT_LANGUAGE']
+    return session.get('language', current_app.config['DEFAULT_LANGUAGE'])
+
+
+def translate(key: str, default: str | None = None) -> str:
+    language = get_locale()
+    data = load_language(language)
+    if key in data:
+        return data[key]
+    fallback = load_language(current_app.config.get('DEFAULT_LANGUAGE', 'pl'))
+    if key in fallback:
+        return fallback[key]
+    en = load_language('en')
+    return en.get(key, default or key)
+
+
+def inject_i18n():
+    return {'t': translate, 'current_language': get_locale()}