Browser language not available but 100% in Transifex

Browser language not available but 100% in Transifex:
How can this issue be reproduced?

  1. Debian system language settings is set to Galician (My language)
  2. If system settings is changed to spanish or portuguese browser language is changed too
  3. Browser interface language is showing in english

Expected result:
As on transifex galician language is 100% translated and Android Brave browser is perfectly working in galician language, the expected result is Brave showing galician interface on desktop too
Brave Version( check About Brave):
Version 1.73.104 Chromium: 131.0.6778.204 (Official Build) (64-bit) On debian 12
Additional Information:
I´ve tried to change Language enviromental variable to gl_ES (code for galician language) and it didn´t work