net/tigervnc(-devel): runtime and stage-QA fix

Previous attempts to run tigervnc resulted in the server quitting:

vncserver: couldn't find "mcookie" on your PATH

With the attached patch, the vncserver now generates the "magic cookie".
While here, add the missing vietnamese translation to fix stage-QA checks.
The -devel version got the same fix and was revbumped even though it is
still ignored since it's no newer than the stable version.

PR: 213150
Reported by: Zane Bowers-Hadley (vvelox [at] vvelox.net)
Submitted by: maintainer