Add new rule for awarding badges based on users sum of discussion and comment count

Added definitions to en-CA language file (including one minor correction)
Major changes of German translation
1. overworked file so that it reflects structure of en-CA file
2. added missing translations
3. deleted not used definitions
4. did some corrections to existing translations
Merge pull request #33 from R-J/master

Add rule for badges based on sum of discussion and comment count