Man page fixes

[mariobl]

While translating the man pages, I found some typos and formattings which doesn#t match the rules described in man(7). Additionally, I've added file headers with license declarations.

[vmatare]

Thanks a lot for your work and sorry for getting back on it so late. I see some changes that I like, but also some things I don't. The most ovious problem I see is that the word thinkfan should not be set in bold everywhere. It creates too much visual clutter, i.e. drawing attention to the word thinkfan does not improve the visual ergonomics of the text.

The next thing is that in many places where you're changing bold to italic or vice versa, you're breaking a convention I've tried to establish/maintain (at least in the config manpage, but maybe not entirely successfully). The convention is this:

• Every string that can appear verbatim in the config is bold
• Names for placeholders, i.e. everything that is filled out by the user and does not appear verbatim in the config is italic

It would be great if you could change your PR accordingly. Writing good documentation is difficult and time-consuming, so I can use all the help I can get ;-)