add english language support

[maxnoe]

I will add language support using the translations package for people who want to write their thesis' in english.

[NicoJG]

Have you by any chance worked on this in the past? I think there are many people who would very much appreciate an English version of this template. (including myself)

[NicoJG]

I made the changes myself and made a pull request for this. #12