documents: use blue icons in sidebar and standard footer, re #4235

git-svn-id: svn://develop.studip.de/studip/trunk@31155 c5b85792-5220-0410-ad23-ed5b6b8ad999
documents/general tables: h2 in caption is no longer bold, re #4235, re #4515

git-svn-id: svn://develop.studip.de/studip/trunk@31156 c5b85792-5220-0410-ad23-ed5b6b8ad999