I contacted the developer. His answer is:
"Hi there,
I'm afraid it's so long since I designed and built the zenphoto theme that my knowledge about the theme is no longer relevant. Other developers have changed, improved, and expanded the default theme, so despite my name still being attached, I've had very little to do with it lately.
So unfortunately, I can't help you.
But I would recommend you ask your question in the zenphoto forums:
http://www.zenphoto.org/support/
Joen"
Okay. So, back at the beginning.
I tried to find all » and stuff and replace it. Somehow I made a mistake. Now theres not shown » but weiter>>
Could you please describe step-by-step what and where I have to replace? Or could you find somebody to update the Default Theme?
Thank you,
Hanna