Hi sacredpath,
many thanks for your help and the useful links!
I will read about child themes very soon. (I'm a WP newbie. Right now I'm just trying out different plugins, customizing code etc. When I know what plugins I need and what not and what I can do with the code, I will start with a fresh WP installation including child theme).
The link underline deletion worked like a charm!
Also the flags are bigger now. But the small ones are still visible above them. BTW: I made them big in the first place, but there seems to be some code in the nav bar that overwrites this and makes them small. (On the German flag I deleted the following code to see what happens, but this makes things even worse:
display: block;
width: 50px;
I leave it for now so you can see what happens.)
The widgetizing seems to be a little bit of learning, so I have to postpone this to next week.
If you have any idea about the Little flags still appearing, that would be much appreciated. :-)
Thanks again,
Andi