For historical reasons, the implementation made several assumptions
about the query structure being flat. Instead of attempting to implement
support for the nested queries added in recent versions of Drupal, this
commit instead rewrites the query implementation based on the current
SQL Query implementation.

These changes were implemented jointly with several others during the
WissKI Hackathon in late 2020 and subsequent WissKI HackDays.
Thanks to everyone who participated, but in particular:

Arne Fitschen <fitschen@ub.uni-heidelberg.de>
Myriel Fichtner <myriel.fichtner@uni-bayreuth.de>
Mark Fichtner <m.fichtner@wiss-ki.eu>

entity references have no language and thus in case of changes, items that should be deleted were not deleted properly from the system; see code comment for more information

fixed the bug that titles are empty in languages in which they were not translated yet. If a title is not translated in any language, it will show up in the language which were used while creation.

My Fi authored 4 years ago and knurg committed 4 years ago

my first commit :) Fixed some language issues, for future me: edit the Sparql11EngineWithPB: loadPropertyValuesForField()

my first commit :) Fixed some language issues, for future me: edit the Sparql11EngineWithPB: loadPropertyValuesForField()

my first commit :) Fixed some language issues, for future me: edit the Sparql11EngineWithPB: loadPropertyValuesForField()

my first commit :) Fixed some language issues, for future me: edit the Sparql11EngineWithPB: loadPropertyValuesForField()

Added first push towards translation - DO NOT USE YET, THIS WILL CORRUPT YOUR SYSTEM - DONT TOUCH - DANGER ZONE - NUKLEAR LAUNCH DETECED -