Localization (#1)

Implement comprehensive content localization, admin panels for editing each language, AI translation interface with automatic updates when base language version is changed.
- SEO tags for all language URLs
- Uses accept-language by default, ?lang=en overrides temporarily
- User edits patched on top of translations
- RTL language supportReviewed-on: https://git.zi.fi/LeoVasanko/pagerite/pulls/1

pyproject.toml

@@ -21,7 +21,7 @@ dependencies = [
     "fastapi[standard]>=0.141.1",
     "html5tagger>=2.0.0",
     "httpx>=0.28.1",
-    "kanta>=0.8.1",
+    "kanta>=0.9.0",
     "markdown-it-py>=4.2.0",
     "maxminddb>=3.1.1",
     "mdit-py-plugins>=0.6.1",