crash upon executing Justine and other problems

[Cranky Old Man]

I'm fairly certain that there's no file that should be called "config/lang_ptest/english (2).lang". When you chose to keep both of those files, the system renamed the newest of them from "english.lang" to "english (2).lang". Try renaming it back. I'm not sure that it will end your worries, but it's a start.