Language cannot be changed in private Tor window

Description of the issue:
When I open a new private window with Tor, I automatically set my language (in this case, Italian) and American English. Going on the settings I can’t choose other languages, this damages my anonymity when I use Tor, because it is possible to determine my language and my possible nationality.
Steps to Reproduce (add as many as necessary):

  1. Click on “New private window with Tor”

Actual Result (gifs and screenshots are welcome!):

Expected result:
The language cannot be changed.
Reproduces how often:
Brave Version(about:brave):
Version 0.61.52 Chromium: 73.0.3683.86 (official Build) (64 bit)

Reproducible on current live release (yes/no):
Additional Information:

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