[TYPO3-core] RFC: #- allow br in flexform labels

[Steffen Kamper]

Additional Info:

some may wonder why not using nl2br(). the reason is, that the function only 
works with "\n" - and here label is in the var and it doesn't work, so i 
used str_replace. Also this happens at the real end before output, so 
hmtlspecialchars is processed before.

There is also the question where documentation should go - please give me an 
advice if you know a good place, i will do it as follow up.

vg  Steffen