[FIX] translation: Resize side by side panels widths as well as heights

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48068 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] fullscreen edit: Position actions bar properly on all themes, and raise z-index to cover over some themes' random z-index settings.
Also add a background colour (some dark themes updated...)
Should fix wish4801, thanks Olaf-Michael

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48069 b456876b-0849-0410-b77d-98878d47e9d5