Hi Christ,
Hope you are doing good!
I see that you would like to configure the Atlas UI in different languages. On testing, though I didn't do any changes from the Service configs but we can achieve this via the Web-browser Settings itself.
a) Like for Chrome browser: Go to Settings >> Search for 'language' >> click on language tab and add your preferred language on top of the list.
b) OR you can just Right-click on the Atlas UI webpage and click on 'Translate to' and select the required, that would change just your Atlas UI session language quick (if that suits your requirement):
Ref: https://support.google.com/chrome/answer/173424?co=GENIE.Platform%3DDesktop&hl=en
Regards,
Shantanu Singh