Release 1.17.12

• Improve starting of the setup tool, make it work correctly when starting from a git clone (Resolves: mike-fabian#179)
• Migrate from Gtk.main() to GLib.MainLoop() (Resolves: mike-fabian#180)
• Stop using deprecated keyword arguments “flags” and “message_format” when creating Gtk.MessageDialog() (See also: mike-fabian/ibus-typing-booster#377)
• Increase pygame.mixer's buffer size (See also: mike-fabian/ibus-typing-booster#681)
• Translation update from Weblate (ca 85.5%, es 100%, fa 11.8%, pt_BR 100%, zh_TW 100%)