It seems that in 2nd and further language any other plugins than YAMS are not triggered anymore onWebpageInit Event, no matter how you order the execution of.
I created a test Plugin with just a "error_log(’plugTestYAMS envoked’);" inside with the onWebPageInit Event checked. Now you can follow in error_log that the plugin is executed in default language but not in any other language.
I solved the problem above with the Encryption snippet
placed in the template instead of using the SSL Plugin. Everything’s ok now as far as I see.
But this issue would be nice to be found in the documentation. It took me a few hours to find out.