The user-facing string stuff is definitely the thing that drives me the most nuts. I guess it's nice that it defaults to gag-inducingly transparent, but I don't think the backend structure should be written out in the title element of the app.

What' especially annoying is when you as a code reviewer have to go through tons of such comments that keep distracting you because the author could not bother reading those comments and assessing that they contain references to prompts / instructions that are completely irrelevant to he target audience