bug#37872: GUIXS cannot log in using cyrilic

[Иван Фарленков via Bug reports for GNU Guix]

after sellecting XFCE DE, choosing phonetic russion keyboard and setting user 
Админ with password парол i was unable to log in as this user (System checked 
my password for a short ammount of time before kicking me back to user select 
screen). I did not misspelled my password as i enterd it wrong afterwards and 
it produced diffrent results.
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Иван Фарленков