Avoid hyphenation (in newer browsers)
(MoM requested, that words should not get broken at all, because the
quality of the hyphenation(ger: Silbentrennung) depends on the quality
on the browser)
So I added the hyphens property. This is a new property and widely not
supported yet. But it is the only way to achieve this, since word-break
does not give us this possibility.