German version to be replaced by English

I have trial version of DevonThink Pro Office. I am going to buy full version but I would rather like English version of it. As my OS is German the German version was installed.
Can I switch between from German to English within the DTP office? So far I did not find any options for that. As my trial finished, I need to purchase the license but I am not happy to have just German full version and not English.
Can somebody advise something please?

The only possibilities to change the language for just one application is to temporarily change the system language before launching the application or to remove all other localizations from the application package. The first possibility is cumbersome, the second one definitely not recommended (and cumbersome too as it has to be done after each update again)