x11/qterminal-l10n: Update to 0.12.0

While here, set maintainer to Jesper Schmitz Mouridsen
<jesper@schmitz.computer>, maintainer of other lxqt related ports.

PR: 223225
Submitted by: Olivier Duchateau <duchateau.olivier@gmail.com>
Approved by: Jason Bacon <bacon4000@gmail.com> (maintainer)