introduce a default render implementation on the base widget, which
add_media and then call the newly introduced method
_render(form, field, formrenderer), abstract of the base widget class.
This allow a litle code factorisation and avoid to forget the call to
add_media in subclasses.
msgid "read_perm"
msgstr ""
msgid "add_perm"
msgstr ""
msgid "update_perm"
msgstr ""
msgid "delete_perm"
msgstr ""