Ger tranlation + mo's, po's & pot updated due to last changes +

small fix to make the "Return" link on Update Page more informative
Select distinct random albums
Prefix sidebar cookies with sb_
Merge branch 'KaivoAnastetiks-develop' into develop
Merge pull request #226 from Psy-Virus/develop

Ger tranlation + translation files updated due to last changes +
Add xml parse error details in AmpacheApi logs
Add current line information on xml parse error
Add donate button in footer
Add missing Donate icon
Changed URL of the browse menu for Ajax calls.

Added the content.ajax.php that handles the actions from the sidebar
URLs. It calls the browse.php file as this browse.php handles all
that is needed to render the content.

Disabled the top and bottom boxes of the UI when it's an Ajax request.

For some reason, calling the Tags Cloud in Ajax like that breaks the
cloud display, hence why I didn't change this URL.