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MC uses the Language you initially set to scrape the series, without fallback. This is so Users know when info is not present.

We suggest you pay it forward, sign up with TheTvDb, and add the missing information for the episodes so more users of TheTVDb benefit.
You may also note there is no German info for the Three specials.  

I agree with you that it would be better if I add this information in German language. However there is currently no official German episode name. Same goes for example for Suits.

I have mixed languages for some shows. New seasons which are not yet available in German I collect in English. So for me a fallback or at least a "per season" language would be great. I think kodis scraper has something like this as optional setting. So users that don't like the fallback could just disable it, but for me it would help a lot. If you don't agree with that, I think I'll have to life with it and scrape everything in English language only.   

No won't be adding support for fallback to episodes at present, I suggest you translate the English title to the closest match in German and add to TheTvdb.
The title can always be altered later down the time when the Scheduled title becomes available. Something is better than nothing.   

Okay thanks for the hint. I added a translation by myself.

However I still don't get how MC decides what to scrape and what not to scrape. For example https://www.thetvdb.com/series/silicon-v...official/6 the title and plot were only scraped AFTER I added a German translation to TVDB.

For https://www.thetvdb.com/series/south-par...fficial/23 there is no German translation but MC just scraped the English ones here without me doing anything. So why did MC use the English information for South Park but not for Silicon Valley? Same (MC uses English information where no German information are available) goes for Suits, The Walking Dead and some other shows.

Note that this happened before the TVDB API issues.