Make HX indicators robust against validation failures

[chrisvanrun]

When adding a title to a display set / archive item that already exists, the validation error causes a partial update of the DOM, messing the the states of the 'Save' button.

This then shows the permanent state of 'Loading...':

The indicators handlers now:

• Listen (also) to: htmx:load
• Cleanup after themselves to make them robust for multiple subsequent calls

[miriam-groeneveld]

Isn't there a filter that will correct that? Or remove the "An" altogether?

[chrisvanrun]

Isn't there a filter that will correct that? Or remove the "An" altogether?

Fixed! An oversight since I was focussing on Archive Items at the time =P