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

     django3.0开始LANGUAGE_CODE前面必须配相应的LANGUAGES配置如下:

from django.utils.translation import gettext_lazy as _
LANGUAGES = [
    ('zh-Hans', _('Chinese')),
]

LANGUAGE_CODE = 'zh-Hans'

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转载自www.cnblogs.com/dhcn/p/12038629.html