Use CRUDP in acl_picker field (part 2)

themes/grav/templates/forms/fields/acl_picker/acl_picker.html.twig

@@ -67,7 +67,7 @@
                                        data-crudp-key="{{ key }}"
                                       {# name="{{ (scope ~ field.name)|fieldName ~ '[][' ~ key ~ ']' }}"#}
                                        indeterminte="false" value=" ">
-                                <label for="{{ field.name ~ '_' ~ key ~ '_' }}">{{ key }}</label>
+                                <label for="{{ field.name ~ '_' ~ key ~ '_' }}">{{ button.letter }}</label>
                             </span>
                         </div>
                     {% endfor %}