Use correct validation rules for description. closes flarum/core#793

extensions/tags/src/TagValidator.php

@@ -21,7 +21,7 @@ class TagValidator extends AbstractValidator
         'name' => ['required'],
         'slug' => ['required', 'unique:tags'],
         'isHidden' => ['bool'],
-        'description' => ['text|max:700'],
+        'description' => ['string', 'max:700'],
         'color' => ['regex:^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$'],
     ];
 }