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Add vala support, which is enabled by default

https://bugzilla.gnome.org/show_bug.cgi?id=693471
Locations: fix entry for Saarbrücken, Germany

Ensheim is just the part of the city with the airport.
Also there seems to be no indication of "Saarbruecken"
being the official English spelling so use "Saarbrücken" instead
like wikipedia does.

https://bugzilla.gnome.org/show_bug.cgi?id=650224
Updated Galician translations
Locations: add Vicenza (Italy)

Vicenza qualifies as a big city (>100'000 inhabitants), as per the project's
wiki page.

https://bugzilla.gnome.org/show_bug.cgi?id=701925
Release 3.9.91
Post release bump to 3.9.92
Updated Spanish translation
[l10n] Updated Italian translation.
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