If this is about an iTunes Store purchase of a TV show using a German Apple ID account, then it seems that House seasons are available in two language editions, as two different Store items. One for German language, one for original English language. Unfortunately, you can’t change language for this after buying.
If you accidentally purchased the wrong edition, then ask the iTunes Store staff for assistance to undo the incorrect purchase, and redo the correct purchase.
To select the wanted language edition, check for the differences: English vs. German description, Season vs. Staffel, ‘Dr. House’ vs. ‘House, MD’.

If you are watching this series through a different content provider/streaming service, then please specify.
If you are watching this from a different country, then please specify.
If you made a purchase with an Apple ID account set to a different country, then please specify.