Revisited editprofile.php, now with better validation and error handling. If input fields are left empty the empty data is now also sent to the server.
Fixes #175. Friend names don't move anymore while avatar is loading
Replaced track preview image with placeholder
Fixes some missing translations, box sizes in mapsandstatistics.php, bugs in dashboard.php, a little code cleanup for profile.php
Merge pull request #177 from MartinDueren/dev

Better error handling editprofile.php, closes #175, closes #172