Given: Website uses copy / free mode of localization.
and Editor selects specific events to display.
Then: Those events should be displayed as selected.
Before this change the sorting was applied on uid of objects,
which is the uid of default lanugage record. But editors might select
localized uids. Therefore a fallback is added in case no object was
found.
Relates: #8557
Make controller smaller, remove unused code.
Move creation of demand object into its own factory.
Reduce npath complexity in repository and move parts into named methods.
Allow editors to select specific events to display.
Therefore add new necessary demand and setting for events and respect
them within repository.
Relates: #8092
