Lock Screen shows date as, for example, "29 de outubro de quinta", which reads weird
I would prefer the day of the week to go to the beginning and drop the "de":
Quinta 29 de outubro
What about using the full name of the weekday to make it more readable, and add a coma?
Quinta-feira, 29 de outubro
Although using the full name of the week day would need to be consistent with the rest of Gnome (in the notification tray it's just "quinta"), so if the choice has been done to stick with the informal name, that's ok.
P.S.- Obrigado por todo o vosso trabalho!!