Finish rendering workspace categories. Note, there is still a icon selection bug, but rendering is ok.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1131 3c3d7b80-5828-415e-9f61-280b98178fff
Improve CSS.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1132 3c3d7b80-5828-415e-9f61-280b98178fff
Improve code issues which might be the reason for the ExtJS data view selection problem.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1133 3c3d7b80-5828-415e-9f61-280b98178fff