Add wikidata prefixes to wdqs

[eloiferrer]

Issue description: The following prefixes and the equivalents for MaRDI need to be added to prefixes.conf

PREFIX wikidata_wd: http://www.wikidata.org/entity/ PREFIX wikidata_wdt: http://www.wikidata.org/prop/direct/ PREFIX wikidata_p: http://www.wikidata.org/prop/ PREFIX wikidata_ps: http://www.wikidata.org/prop/statement/ PREFIX wikidata_pq: http://www.wikidata.org/prop/qualifier/ PREFIX wikidata_wdata: http://www.wikidata.org/wiki/Special:EntityData/ PREFIX wikidata_wdno: http://www.wikidata.org/prop/novalue/ PREFIX wikidata_prn: http://www.wikidata.org/prop/reference/value-normalized/ PREFIX wikidata_prv: http://www.wikidata.org/prop/reference/value/ PREFIX wikidata_pr: http://www.wikidata.org/prop/reference/ PREFIX wikidata_pqn: http://www.wikidata.org/prop/qualifier/value-normalized/ PREFIX wikidata_pqv: http://www.wikidata.org/prop/qualifier/value/ PREFIX wikidata_psn: http://www.wikidata.org/prop/statement/value-normalized/ PREFIX wikidata_psv: http://www.wikidata.org/prop/statement/value/ PREFIX wikidata_wdv: http://www.wikidata.org/value/ PREFIX wikidata_wdref: http://www.wikidata.org/reference/ PREFIX wikidata_wds: http://www.wikidata.org/entity/statement/ PREFIX wikidata_wdtn: http://www.wikidata.org/prop/direct-normalized/

TODOS:

• [ ] example todo to copy

Acceptance-Criteria

Checklist for this issue:

• [ ] Assignee has been set for this issue
• [ ] All fields of the issue have been filled
• [ ] Issue has been assigned to the main project
• [ ] Code was merged
• [ ] Feature branch has been deleted and issues were updated / closed
• [ ] Issue is tracked by an epic, or the label 'non-epic' is set to the issue.

[eloiferrer]

Add this too: PREFIX Wikidata: https://query.wikidata.org/sparql

[eloiferrer]

I've added them already to the staging server.

[eloiferrer]

Done also for portal.mardi4nfdi.de https://github.com/MaRDI4NFDI/srv-mardi02/commit/1f10c79e2fb456e0018e240f09901aa237369829