Add Linkki broadcast image

linkki-tiedotus/webapp/i18n.py

@@ -0,0 +1,42 @@
+import json
+from pathlib import Path
+
+from webapp.auth import SUPPORTED_UI_LANGUAGES, normalize_translation_language
+from webapp.config import ConfigFileError
+
+
+TRANSLATIONS_DIR = Path(__file__).resolve().parent / "translations"
+TRANSLATION_CATALOG_FILE = TRANSLATIONS_DIR / "catalog.json"
+
+
+def load_translations(language: str) -> dict:
+    normalized = normalize_translation_language(language)
+    catalog = load_translation_catalog()
+    merged: dict[str, object] = {}
+    for key, translations in catalog.items():
+        if not isinstance(translations, dict):
+            continue
+        english_value = translations.get("en")
+        localized_value = translations.get(normalized)
+        if localized_value not in (None, ""):
+            merged[key] = localized_value
+        elif english_value is not None:
+            merged[key] = english_value
+    return merged
+
+
+def load_translation_catalog() -> dict:
+    if not TRANSLATION_CATALOG_FILE.exists():
+        return {}
+    try:
+        payload = json.loads(TRANSLATION_CATALOG_FILE.read_text(encoding="utf-8"))
+    except json.JSONDecodeError as error:
+        detail = f"Invalid JSON: {error.msg}"
+        if "Invalid control character" in error.msg:
+            detail += " JSON strings cannot contain raw line breaks; use \\n instead."
+        raise ConfigFileError(TRANSLATION_CATALOG_FILE, detail) from error
+    return payload if isinstance(payload, dict) else {}
+
+
+def language_options() -> list[dict[str, str]]:
+    return [{"code": code, "label_key": f"ui_language.{code}"} for code in SUPPORTED_UI_LANGUAGES]