Merge pull request #3921 from jackmu95/add-mimetypes-translation

Add missing translation for `mimetypes` validation

resources/lang/en/validation.php

@@ -52,6 +52,7 @@ return [
         'string'  => 'The :attribute may not be greater than :max characters.',
         'array'   => 'The :attribute may not have more than :max items.',
     ],
+    'mimetypes'            => 'The :attribute must be a file of type: :values.',
     'mimes'                => 'The :attribute must be a file of type: :values.',
     'min'                  => [
         'numeric' => 'The :attribute must be at least :min.',