Hi Linda and John,
WELCOME here on HOBBY-Wohnmobilforum.de 
As Charly mentioned already, we have a few members registered here, but so far no posts, which I could remember.
You can set the frontend language in your profile to en-GB. This will set a few settings to english, however, not all, by far.
When you open your profile, you see on right side (within the grey stripe "Profil von hobbylunartic" on the right side a button "bearbeiten", which means "edit".
Then you see "Generelle Einstellungen" (Global settings) and there you'll find "Frontend-Sprache" (Frontend Language).
If you have any question, do not hesitate to ask, someone will have the right answer, I'm sure 
Meanwhile, have fun with the Optima, which is a nice Motorhome, indeed!