Bump django-modeltranslation from 0.19.11 to 0.19.12 #1637

Job	Run time
Tests - Content	4m 23s
Tests - Django system check	1m 47s
Tests - General	3m 13s
Tests - Management	3m 37s
Tests - Resources	2m 44s
Tests - Documentation	24s
Tests - Style	2m 10s
Create static files	0s
Create resource thumbnails	0s
Create resources	0s
Create at a distance files	0s
Create and publish Docker image	0s
	18m 18s

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