Improve the label and hint for the Editor and Content meta properties of a TextArea xproperty

Users of my AWM now and then paste large blocks of text with invalid XWiki syntax into textarea fields, that have the WYSIWYG editor set in the xclass definition. While they are able to save the nonsense (probably using the source view), they are not able to correct their mistake, since the WYSIWYG editor fails to load when pressing the edit button. I have to change the class definition to load the text editor, correct the mistake and switch the editor again.

The edit sub-menu contains items WYSIWYG and Wiki, which to me seem useless, when editing an xobject page. It would be great, if choosing one of these items would override the configured editor for all textarea fields of the xobject. WDYT?