aligned translations to source file

removed an unneccessary space at the end of about_openstreetmap in
english source translation file
aligned translation files to english source translation file (added
reminders for missing translations)
added line-breaks to values-gr
changed indent size from 2 to 4 in values-iw
removed unneccessary line-breaks in values-mr
Merge pull request #688 from Djfe/master

aligned translations to source file