Translation for system message not being used - 2.5

Similar closed bugs:
Translation for system message not being used
Translation for system message not being used - 2

This bug is not quite a repeat but in the ballpark of the other two.

At Discourse site for SW-Prolog in the administration menu ( Users -> Silenced) noticed a sliced user so I clicked on their tag to see the reason and unsilence them.

Found:

Reason : Novo usuário digitado muito rápido

Original language: Portuguese

Translation: New user typed too fast

Expected the reason to be in the language of the administrator: English

Checked latest update:

image


EDIT 09/10/2019

Another example:


EDIT 09/18//2019

In posting section of settings:

In trust levels section of settings: