Remove mapgen_air alias (#935)
FIx wrong error message on invalid use of the formspec element image_button
Add Czech language
Translated using Weblate (German)
Translated using Weblate (French)
Translated using Weblate (Dutch)
Translated using Weblate (Chinese (China))
Translated using Weblate (Portuguese (Brazil))
Translated using Weblate (Dutch)
Translated using Weblate (Portuguese (Brazil))
Translated using Weblate (Spanish)