Refactor HTML

See merge request !1718

avoid negative margins

See merge request !1716

refine multi-guardian wording

See merge request !1712

rm JSONField model_bakery compat

See merge request !1723

fix empty email link

See merge request !1717

fixed in model_bakery 1.2.0

https://github.com/model-bakers/model_bakery/blob/main/CHANGELOG.md#added-2

-   not available in bootstrap5
-   hacky in the first place

set image dimensions in HTML

See merge request !1715

this allows the browser to do currect layout before the images have
loaded.

The exact numbers are not relevant, only the aspect ratio.

exclude blocked subjects from data protection dashboard

See merge request !1713

integrate requirements-dev.txt into setup.cfg

See merge request !1710

indicate other subjects under guardianship

See merge request !1709

fix off-by-one error in date-of-birth statistics

See merge request !1711

List styling

See merge request !1706

fix additional suitability translation

See merge request !1708

restore date of birth attribute creation in create_demo_content

See merge request !1707

reverts part of 89d86415

signals are not sent on bulk_create

1904 translations

See merge request !1704

to avoid uncommon words like "mündel"

move subject.blocked in template

See merge request !1705

Fix html

See merge request !1703

complete changelog for 0.54.0

See merge request !1702