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
31141	translation.E004 shouldn't be raised on sublanguages when a base language is available.	Enrique Matías Sánchez	Mariusz Felisiak	"According to Django documentation:

''If a base language is available but the sublanguage specified is not, Django uses the base language. For example, if a user specifies de-at (Austrian German) but Django only has de available, Django uses de.''

However, when using Django 3.0.2, if my settings.py has
{{{
LANGUAGE_CODE = ""de-at""
}}}

I get this error message:

{{{
SystemCheckError: System check identified some issues:

ERRORS:
?: (translation.E004) You have provided a value for the LANGUAGE_CODE setting that is not in the LANGUAGES setting.
}}}

If using
{{{
LANGUAGE_CODE = ""es-ar""
}}}
Django works fine (es-ar is one of the translations provided out of the box).

"	Bug	closed	Core (System checks)	3.0	Release blocker	fixed		pope1ni	Accepted	1	0	0	0	0	0