More debug menu string cleanup

Continuation of #7139.

This makes some more strings of the debug menus translatable. Vehicle names, skill names and trap names show now the display names along to the techincal names, for convenience. But not for the skill names, the skill display names are unambigious.

Fixes #6587. I *think* this PR doesn’t break anything, but please check for yourselves before merging, just to be sure.