This could be fixed with multi-line labels, but that's not possible yet. I think it's best to add a feature request in mxdn.
I would like to propose 2 workarounds:
Answer for Fedor:
Both possibilities aren't usefull, because:
1: I just can't get less text then I have now 2: This is not inline with my general form layout.
Answer for Herbert:
< BR > or < BR /> doesn't work
Try using < br/> in your label. Without the first space character, but i have to use that in my post. Otherwise it's a break in my post ;).