turnermm
Your problem has called attention to something I was not aware of, which is that the new style CKEditor localization for plugins does not default to English. Still, you should only have found an 'undefined' in place of the missing langauge strings, so that I don't know what happened in the German language file, despite repeated testing. I can do some translation from English to German but I don't trust my idiomatic grasp of German.
Now that I am aware of this, I've made some changes so that the problem you have had will not repeat in the other plugins where I have followed this scheme.