FEAT(client): Drop the version from window title

[vvillenave]

Having the release number is rather non-standard behavior
(see #1260 and comments), but it is also particularly annoying
for visually-impaired users who, everytime they Alt-Tab into
the Mumble window, have to listen to the quite lenghthy
digit sequence (which may get even worse with distro-issued
builds: the current window title in Debian stable is
"Mumble -- 1.3.0~git20190125.440b173+dfsg-2"; now try
reading that out loud and imagine hearing it multiple times
in a row!...).

The Transifex bot will need to be run if this gets merged.

Checks

• My commits follow the commit guidelines

[Krzmbrzl]

My commits follow the commit guidelines

Please don't check checkboxes blindly. Your commit does not follow the commit guidelines at all. Please fix that (I would consider this to be of TYPE FEAT).

As for the translations: You can update them yourself. After having fixed your commit, run scripts/updatetranslations.py and that will take care of adding a separate commit that will update the translation files for you.

[vvillenave]

That script does not run:

  File "./scripts/updatetranslations.py", line 138, in <module>
    (resnsrc, resnnew, resnsame) = Update(lupdatebin, tsfile, args.debuglupdate, applyHeuristics = not args.ci_mode)
  File "./scripts/updatetranslations.py", line 87, in Update
    logging.debug('stdout: ' + res.stdout)
TypeError: can only concatenate str (not "bytes") to str

[davidebeatrici]

Are you perhaps using Python 2 instead of 3?

[Krzmbrzl]

I ran the translation script and also changed your commit message's title a bit.

[Krzmbrzl]

Thank you for your contribution 👍