Fixed quality issues #130

Job	Run time
Visual tests	1m 21s
Run tox environment quality	29s
Run tox environment dist-validation	20s
build (Python 3.8, Django 4.2)	1m 23s
build (Python 3.8, Django 5.0)	1m 20s
build (Python 3.8, Django 5.1)	1m 28s
build (Python 3.8, Django main)	1m 16s
build (Python 3.9, Django 4.2)	1m 20s
build (Python 3.9, Django 5.0)	1m 18s
build (Python 3.9, Django 5.1)	1m 21s
build (Python 3.9, Django main)	1m 16s
build (Python 3.10, Django 4.2)	1m 24s
build (Python 3.10, Django 5.0)	1m 18s
build (Python 3.10, Django 5.1)	1m 22s
build (Python 3.10, Django main)	1m 23s
build (Python 3.11, Django 4.2)	1m 20s
build (Python 3.11, Django 5.0)	1m 21s
build (Python 3.11, Django 5.1)	1m 17s
build (Python 3.11, Django main)	1m 18s
build (Python 3.12, Django 4.2)	1m 26s
build (Python 3.12, Django 5.0)	1m 24s
build (Python 3.12, Django 5.1)	1m 23s
build (Python 3.12, Django main)	1m 20s
	29m 8s

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