Hi Shivam,
thank you for your response. I already knew the trick concerning pressing Crtl, when launching Acrobat. However this does not solve my problem, since I cannot expect users to know about this option.
Same is true concerning the preferences settings. English users of course won't be able to change the language since they cannot read a german menu structure.
Sadly I can also not find a proper solution within the customization wizard. I wonder why there is no option like "let user select language at first startup".
I have tried to come across this issue and created a script which will be executed only the first time a user logs on to the terminal server (no local profile available on the machine). It creates a registy key called "select" under: HKEY_CURRENT_USER\Software\Adobe\Adobe Acrobat\2017\Language". This item obviously forces Acrobat to ask which language to select. After selecting a language, the entry will disappear (which is the reason, why the script runs only once). This solves my issue for new users. Nevertheless it's still a problem for existing once, since i would need to update all "Current_User" keys on the machine.
Kind regards,
Morris