[1.4.x] Fixed #18472 - Added warning regarding set_language / i18n_patterns.
[1.4.x] Fixed #18472 - Added warning regarding set_language / i18n_patterns.

Backport of d7816c563b58ed53d49956321d549a16e2b2ebc0 from master.

riklaunim/django-custom-multisite,riklaunim/django-custom-multisite,riklaunim/django-custom-multisite