Apply thumbnail-settings on 'Album-covers' [#3924], <br />Bugfix for [#3927], <br />Added missing /div to thickbox-template, <br />fixed an issue with generating thumbnails when no thumbs <br />available in ImageManager, <br />improved the naming of thumbs, <br />Bugfix for [#3931], <br />Prevent display the content of galleries that are set as inactive.<br />Added an 'apply'-button to template editor