rendering bug of volume_properties fixed for ie
fixed screen width in a mozilla/ie compatible way
added german translation: 'log', 'network', 'volume_automount' and 'volume_details'
fixed config management of 'plugin_manager' plugin
fixed filtering of log level messages for 'logs' plugin
updated documentation for ssl configurations
changed default installation destinations in setup.py
added nice background images to environment and help messages
replaced message 'div' with 'fieldset'
moved stylesheet data of plugins to html header (as required by spec)
removed obsolete css definitions
removed obsolete old perl/bash code
improved 'update_po_files': remove obsolete msgids
functionality of 'update_english.sh' moved to 'update_po_files'
omit 'weblang' link attribute if it does not change the default setting
changed default language from 'de' to 'en'
fixed template bug that prevented the translation of plugin links
fixed invalid html
implement filecheck overriding for unittests
