Refs #3430 Committing first set of files coming from oTrance platform.

I had to edit the tests to clean up the files with the new system
: 
 * remove english translations of non translated strings, which were automatically put in the translated files
 * Keep ordering of language strings similar to the english file

git-svn-id: http://dev.piwik.org/svn/trunk@7138 59fd770c-687e-43c8-a1e3-f5a4ff64c105