fix(store): localized category labels, 'Studio & Designs' tab in German

'document' rendered as a raw lowercase English token next to
localized neighbours; unknown categories at least capitalize.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/pages/store.dart

@@ -860,8 +860,13 @@ String _categoryDisplayName(BuildContext ctx, String wire) {
       return l.storeCategoryWeb;
     case 'orchestrator':
       return l.storeCategoryOrchestrator;
+    case 'document':
+    case 'doc':
+      return l.storeCategoryDocument;
     default:
-      return wire;
+      // Unknown wire categories still render presentably —
+      // capitalized, never a raw lowercase token.
+      return wire[0].toUpperCase() + wire.substring(1);
   }
 }