Link to user registration

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.6.2

Hi,
I have a problem with the user registration. On my site the user has to register first before he has access to the shop. I use the Joomla user registration with the Hikashop plugin. That works fine, but the link 'Don't have an account?' leads to a shop category and if the user changes the language the side of the shop category opens. That is really weird and happens only on the english site. The german site works.
Is there a possibility to associate the register form with the two languages? I did it for the menu 'myWaldorf'. That works, but as soon as a user clicks on 'Dont't have an account?. the translation association doesn't work anymore and the user will see a shop category side instead of the german register page.
Here a link to my register site: www.waldorf-music.info/en/user-login
Thanks
Roger

Hi Nicolas,
thanks for the answer. I did this, but no changes.

The German one goes to:
www.waldorf-music.info/de/hikashop-menu-...trol-panel/user/form
That is ok.

But the English one goes to.
www.waldorf-music.info/en/blofeld-software/user/form

This URL www.waldorf-music.info/en/blofeld-software is part of the shop and shouldn't be shown during registration.

Is there any other function in Hika Shop, where I might accidently put this URL?

Thanks
Roger