I finally (!!) succeeded in installing multisite wordpress with domain mapping. Ouff.... And installed the multi language switcher.
Now, I thought about it before, but not thoroughly perhaps, I see that my theme (colorway) can't be network activated. Reasons seems to be that the language directory with .pot file is missing.
My primary site runs that theme. But my second domain can't see it.
Do I have to create now a POT file? And if, how? Like this skippy-explanations?
Thanks for any hints!