PT-3774: Revert edits and show notification when you can't edit text

[tjcouch-sil]

This is a quick bandaid fix to the problem of looking like you can edit but you can't. We plan to make better changes in [PT-3043] When user attempts to edit book which they have no permission to edit: inform them of permissions, prevent editing - Jira, but that will take design and implementation like this will not.

Note: I could have put this exception in more places on the backend, but I decided I'd rather not disrupt things and refactor a bunch of stuff right now when there are already two other things in SetChapterUsx that aren't in SetChapterUsfm (and likely in the other Set methods, but I didn't look). For now, I'll just do this shortcut since this is a bandaid in the first place. We can do a better job later.

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This change is