refactor: localize UI labels and store filenames

tests/test_ui_imports.py

@@ -60,3 +60,20 @@ def test_housekeeper_details_are_multiline() -> None:
     assert rendered.splitlines()[0] == "ERROR · invalid_member_record"
     assert "Mitgliederakte beschädigt\nFällig:" in rendered
     assert rendered.endswith("nicht automatisch überschrieben.")
+
+
+def test_german_ui_labels_round_trip_to_english_storage_keys() -> None:
+    from ccma.domain.models import MEMBERSHIP_STATUS_LABELS
+    from ccma.ui.labels import (
+        CLAIM_ITEM_TYPE_LABELS,
+        THEME_LABELS,
+        display_label,
+        storage_key,
+    )
+
+    assert display_label(THEME_LABELS, "dark") == "Dunkel"
+    assert storage_key(THEME_LABELS, "Hell") == "light"
+    assert display_label(CLAIM_ITEM_TYPE_LABELS, "credit") == "Gutschrift"
+    assert storage_key(CLAIM_ITEM_TYPE_LABELS, "Dienstleistung") == "service"
+    assert display_label(MEMBERSHIP_STATUS_LABELS, "active") == "AKTIV"
+    assert storage_key(MEMBERSHIP_STATUS_LABELS, "EHRENMITGLIED") == "honorary"