Call for translations for 1.6

[maxxer]

We're preparing 1.6 release (#488), before merging @TonisOrmisson's work for Bootstrap 5 compatibility.
I'm calling out previous translators, if they're still willing to update strings for the usuario project, before we tag final 1.6.

The goal is to release 1.6 by half January, so translations should come by next Monday, Jan 9th.

For those willing to participate, create a new merge request as usual. Please remember to add yourself to line 15 of the CHANGELOG.

Thank you.

@quique
@EvgenyOrekhov
@Dezinger
@gugoan
@jkmssoft
@bizley
@mrbig00
@faenir
@tekord
@thyseus
@TonisOrmisson