Feature/improved translations

[HLXEasy]

The next bunch of changes:

• Cleanup some nearly similar strings into one
• Added more string to translations
• Streamlined naming of different network types
• Use translated network names on settings page

Please have a look especially at the last commit (0a007bd). Works here on my build without issues, switch between networks still works like a charm.

Oh yes, ./check has nothing to complain about. :-)