feat(quick-261003-387): Verwaltungsseite Kategorien, Marktplatz-Reihenfolge, Formular, Texte, CHANGELOG und Handbuch

- Administrator -> Module -> Kategorien: anlegen, umbenennen, sortieren, Eintraege zuordnen und sortieren, loeschen mit Zielauswahl
- Marktplatz-Filter folgen der Kategorienreihenfolge, Kategorieseite und Modulliste zeigen gespeicherte Namen
- Formular fuer eigene Module bietet alle Kategorien der Organisation an
- Texte de/en, CHANGELOG, Handbuch Administration und Anwender

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/web/src/messages/en.json

@@ -864,6 +864,7 @@
     "deactivateSuccess": "Module deactivated successfully",
     "error": "Error managing module",
     "grantsLink": "Grants Matrix",
+    "categoriesLink": "Categories",
     "grants": {
       "title": "Grants Matrix",
       "searchPlaceholder": "Search modules or groups...",
@@ -874,6 +875,40 @@
       "saveError": "Could not save grant. Please try again.",
       "noSearchResults": "No match for \"{search}\" — neither in the modules nor in the groups."
     },
+    "categories": {
+      "title": "Categories",
+      "description": "Decide how modules are grouped and sorted in the sidebar and in the marketplace. The setting applies to all users.",
+      "backToModules": "Back to Modules",
+      "createLabel": "New category",
+      "createPlaceholder": "Category name",
+      "createButton": "Add category",
+      "moveUp": "Move category up",
+      "moveDown": "Move category down",
+      "itemMoveUp": "Move entry up",
+      "itemMoveDown": "Move entry down",
+      "rename": "Rename",
+      "renameLabel": "New name",
+      "renameSave": "Save",
+      "renameCancel": "Cancel",
+      "delete": "Delete",
+      "deleteBlocked": "This category cannot be deleted",
+      "empty": "No modules in this category",
+      "customBadge": "Custom module",
+      "itemCategory": "Category",
+      "itemCategoryLabel": "Category for {name}",
+      "personalNote": "Also {count, plural, one {# personal entry} other {# personal entries}} created by users",
+      "loadError": "The categories could not be loaded. Please try again.",
+      "saveError": "The change could not be saved. Please try again.",
+      "deleteDialog": {
+        "title": "Delete category",
+        "bodyEmpty": "The category “{name}” is empty and will be deleted.",
+        "bodyMove": "The category “{name}” contains entries. These modules are moved to the category you choose here, including personal entries created by users. Nothing is lost.",
+        "target": "Move to",
+        "confirm": "Delete",
+        "confirmMove": "Move and delete",
+        "cancel": "Cancel"
+      }
+    },
     "activationDialog": {
       "title": "Activate Module: {module}",
       "body": "Should the default group get immediate access to this module, or would you rather configure grants separately?",