Customization in themes

Dear developers,

In the thread Change wording of reviewer recommendations - #4 by ctgraham there is a discussion about how to remove choices in the reviewer recommendation drop-down list. I would like to see that to be possible to change in a child theme, i.e. editing the file:
and put it in
to override the former.

It should also be nice if one can do the same thing for language files and other files that can customize the forms too. (I know that some of them work, but not all).