[BUGFIX] Alignment of button "add a new element at this place"

In the page module using the "Languages" view, the buttons "add a new
element at this place" are wrongly aligned.

This patch fixes this issue by adding a div which controls this alignment
by CSS

Change-Id: I9de8a47368682ed0b33c2ebfa0a590402c1ca8ef
Resolves: #56720
Releases: 6.1, 6.2
Reviewed-on: https://review.typo3.org/28276
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters