did you manage to spot which plugin might be the cause of the conflicts?
I did not have time to check myself, but my guess it will be either "Smart Post Show" or "The Plus Blocks", since they are used heavily on all pages...
I looked into the theme and plugin conflict, but everything seems fine without deactivating any plugins. It might have been a temporary glitch which is solved by drecativating/reactivating the plugins: hidden link
Glad to hear your German translation issue is solved.
I checked that link in normal and private browsers and it seems to be working correctly for me as you can see in the attached screenshots. Could you please try to clear your browser cache or try another browser and see if this resolves your issue.