MyMetrixLite.pot: added missing strings
MyMetrixLite.po & MyMetrixLite.mo: updated and optimized German translation
- take over of changes from MyMetrixLite.pot
- translated new strings
- some colors translated into German
- removed inconsistency between plugin and main menu (e.g. Infobar is now Infoleiste)
- renamed a lot of sections, to reduce confusions
- fixed typos
- etc.