eh... didn't we want to remove the language editor?
Hmm... Did we?
I think it may have crossed my mind last month when I was fighting over removing theme support from this (it was by far the most time-consuming file for me), but in the end I did it, AFAIK, and I recognize that the language editor has its good sides: because the strings are stored in the database, they're protected from accidental overwriting, and they allow noobs to easily change some parts of the website without having to play with FTP too much, or simply with the file structure. (You can add a Custom.english.php file, IIRC, to the languages folder and it'll overwrite any string you want, but I'm not sure regular admins will know/want to know about that.)
The only good thing that would come out of removing the language editor, is that I could get rid of language file caching, but considering that all PHP files are cached by now, I would end up re-doing this at some point, so...