Improve schema and update tags

- Make constants in schema explicit
- Enumerate tag-categories
- More i18n utilities
- Better anonymous user support without special field
- Remove most tuples and unchecked type-casting

package.json

@@ -1,7 +1,7 @@
 {
   "name": "gallery-badmanners-xyz",
   "type": "module",
-  "version": "1.5.4",
+  "version": "1.5.5",
   "scripts": {
     "dev": "astro dev",
     "start": "astro dev",