Hi Graffitinetwerk, I think I have a simple solution for you:
1) Please revert back to version 2.6 of the plugin, as that version does not utilize the multi-language page option provided by Google, which has been causing problems.
2) If you notice any language characters being appended to the end of individual words, here is the reason for that:
Google will append characters on the end of words (such as ",en", ",es", ",no") when those words are something other than your default language. So this presents problems for users who, for example, have a German-based website but provide words in English to their website visitors.
For example, on a German website, the word "Facebook" is commonly accepted as English language, so Google will append ",en" on the end of it since it is a German website. And it will do this ONLY when switching back to the default language.
The solution is this: 1) Provide words only in your original language, or 2) add class="notranslate" to the specific areas that have those words on your website. That should fix a majority of your issues.
Let me know how it goes!
I'd be happy to sell you the premium version as well. I will configure it for you to make it work nicely with your site too.
But I would like to wait until we get through some of these issues with this free version, although I'm confident that we have now found the problem.
Let me know how it goes and then contact me here at this page, I will send link to my premium plugin website.