Thanks for the help.
I think you tend on the "Character set" Section
(
http://www.mediawiki.org/wiki/Manual:Backing_up_a_wiki#Character_set).
My prolbem is that my old provider does not provide the console program
"mysqldump".
The only way for me is to export via phpmyadmin. And there I can't use
the option "-default-character-set=latin1".
Is there a way to convert the dump after export?
Yes, your theory is correct. mysqldump will be too
intelligent.
See
http://www.mediawiki.org/wiki/Manual:Backing_up_a_wiki