[TASK] Allow multi-line module menu labels

Labels in the module menu cannot be in multiple
lines. this is especially a problem when the labels
are translated.

The patch introduces a new class for each
submodule item label and adds the proper CSS.

Resolves: #57590
Releases: 6.3
Change-Id: I37b6331d41bd1e6e014bf79596ad928430441f7e
Reviewed-on: http://review.typo3.org/29558
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>