[TASK] Remove exclude for l10n_parent field, because it causes bugs with translations in limited be-accounts

[FEATURE] TYPO3 10 Compatibility

Closes #109, #99, #78, #91, #104, #93, and #106

See merge request !3

Resolves #109.

Implements #99.

Implements #78

Implements #91.

Implements feature requested in #92.

Fixes #104.

Resolves #93.

Fixes #106.

This reverts commit 90c020a8.
The bug that was fixed with the previous commit has since been fixed in
TPYO3 10.4.1 directly.

This reverts commit ae58804d