Ok I'm confuzzled...>_<

Why is it that when we translate Japanese Anime names, we change the translation??
For example:
Kamisama Hajimemashita: Would usually mean "Nice to meet Du god" oder "How do Du do Mr. god?"
Not Kamisama KISS
And Wagnaria. It's translated to english as "Working" but I happen to know that hataraite means "working"
Plus, I'm sure they wouldn't name their restaurant "working."

Anyway, I just wanted to know if there's a reason to all this stupidity :/