9.3.x renamed some options from offensive white and blacklist to include
and exclude.
As we don't want to wait until they get removed in v10, we adjust the
configuration now.
Allow integrator to limit results in widget to certain languages.
If only one language is allowed, labels will be translated.
Otherwise default system language is used.
E.g. one record will be displayed in multiple languages, it would be
confusing to show him multiple times for each language.
Add TYPO3 extension for phpstan as many things would break within tests.
Relates: #15
