[TYPO] Fix bug css revert rev 4122 and add clear:both

revert because was breaking the rendering of forms using oe_title as clearfix hack
adding clear on .oe_form_group to fix the journal form on firefox (block was unaligned, some fields out of the screen)
[MERGE] Merge with 7.0-fix-css-clearfix-jke - bug clearfix on oe_title and oe_form_group