Description of problem:
This BZ is going to be very general due to extent of the problem. When you login to the WebUI switched to some non-english language, including supported languages like french or japanese, many of the strings are not translated from english. The only thing that is translated completely is a top level of the menu but when you go to almost any submenu, you already get ~1/3 of the strings in english. Going to almost any page, you get some content in english, sometimes almost all - e.g. Configure -> Inventory upload.
Two example screenshots attached.
Assigning the severity of High because this looks really bad and unprofessional.

Version-Release number of selected component (if applicable):
Reproduced on Sat 6.12.0, 6.12.2 and 6.13.0 snap 9.0.

How reproducible:
Deterministic

Steps to Reproduce:
Just look at a few pages in the WebUI switched to some language other than English.

Actual results:
Many strings not translated and shown in english

Expected results:
Completely translated UI