Hi Nayeem,
thank you for your reply.
As the site has only german as language, I installed WPML only for translating the plugin.
I uploaded the images on an other plattform.
Language of the website is managed by WPML:
https://postimg.cc/WDpbcKzB
WPML Settings Language Settings:
https://postimg.cc/fVfTFZz7
Language setting of User in WordPress Profile (doesn’t matter if it is set to German or the website preference):
https://postimg.cc/75kZmbkY