id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
30439	Translations issues on Django upgrade due to unexpected changes in plural forms	Michal Čihař	Claude Paroz	"When locales have different plural forms, the ngettext can be easily broken because it uses plural equation from the first loaded gettext catalog for all of them.

For example in Czech locale, there are different plural equations being used even inside Django with either 3 or 4 plural forms. When the one with 4 forms is loaded first, Django is looking for non existing plural in catalogs.

Reproducer in Django 2.2.1:

{{{

>>> from django.utils import translation
>>> translation.activate('cs')
>>> translation.ngettext('This password is too short. It must contain at least %(min_length)d character.', 'This password is too short. It must contain at least %(min_length)d characters.', 1)
'Heslo je příliš krátké. Musí mít délku aspoň %(min_length)d znak.'
>>> translation.ngettext('This password is too short. It must contain at least %(min_length)d character.', 'This password is too short. It must contain at least %(min_length)d characters.', 10)
'This password is too short. It must contain at least %(min_length)d characters.'
}}}


The second invocation is trying to find 4th plural in 3 plurals catalog."	Bug	closed	Internationalization	2.2	Normal	fixed		Maciej Olko	Ready for checkin	1	0	0	0	0	0