Major changes in 3.21.91:
* Updated translations for:
    * Brazilian Portuguese (Enrico Nicoletto)
    * Catalan (Jordi Mas)
    * Czech (Marek Černocký)
    * Finnish (Jiri Grönroos)
    * French (Alexandre Franke)
    * Friulian (Fabio Tomat)
    * German (Mario Blättermann)
    * Hebrew (Yosef Or Boczko)
    * Hungarian (Balázs Úr)
    * Indonesian (Andika Triwidada)
    * Kazakh (Baurzhan Muftakhidinov)
    * Lithuanian (Aurimas Černius)
    * Polish (Piotr Drąg)
    * Portuguese (Tiago Santos)
    * Serbian (Мирослав Николић)
    * Slovak (Dušan Kazik)
    * Spanish (Daniel Mustieles)
    * Thai (Akom Chotiphantawanon)
* New date chooser calendar
* Deprecate GNOME_COMPILE_WARNINGS (Ernestas Kulik)