feat: add page shell, preferences and translations

Base layout with top bar, role-based menu, profile menu and phone layout; theme, language and German form of address kept in cookies; German formal, German informal and English text; Fluent avatar bundled in the image by a Node build stage; placeholder pages for the Publisher and Admin groups.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N3t4WL7bd9bdHHNjEsxzqC

portal/tests/conftest.py

@@ -1,5 +1,7 @@
+from pathlib import Path
 from types import SimpleNamespace
 
+import polib
 import pytest
 
 from portal.adapters import registry
@@ -36,3 +38,19 @@ def adapters():
     registry.install(fakes.directory, fakes.idp)
     yield fakes
     registry.install()
+
+
+@pytest.fixture(scope="session", autouse=True)
+def compiled_messages():
+    """The image compiles the catalogues with gettext; tests compile their own copy."""
+    for po_file in (Path(__file__).resolve().parent.parent / "locale").glob("*/LC_MESSAGES/*.po"):
+        polib.pofile(str(po_file)).save_as_mofile(str(po_file.with_suffix(".mo")))
+
+
+@pytest.fixture(autouse=True)
+def plain_static_files(settings):
+    """No collectstatic in tests, so use storage without a manifest."""
+    settings.STORAGES = {
+        **settings.STORAGES,
+        "staticfiles": {"BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage"},
+    }