Update chooser modal JS to use field IDs with prefixes
Note that the tag field JS no longer needs to be initialised here, as that's done in AdminTagWidget's inline JS
This allows them to work on pages that do not include _editor_js.html (or page-editor.js). However, wagtailadmin/shared/datetimepicker_translations.html will still be required in order to localise the date picker UI.
Move datepicker translations to admin_base.html
The string of self.form is the same as form.as_table - which is too verbose.
This updates the __repr__ of EditHandler/FieldPanel to show the class name of the form being used instead (or NoneType if it's None).
- Fix clear_edit_handler decorator
- Will allow the TestPageEditHandlers test cases to run
- Fixes test for test_check_invalid_base_form_class
- Errors might be returned out of order, so sort them before comparing them to the expected list