construct the foother in defaults.php so that we use always the same footer
check for updates only in the community edition
lib/defaults.php should only contain the default strings and read the other strings directly from the theme
remove unneeded if condition
make mail footer aware of different themes
logo claim added
add logo claim to defaults.php
PHP Strict standards:  Non-static method OC_Defaults::themeExist() should not be called statically
set default logo claim to ''
Merge pull request #3863 from owncloud/improved_footer

Improved footer