improve dictionaries from wikidata

[WolfgangFahl]

see e.g. https://github.com/CSSEGISandData/COVID-19/issues/1908 needed data e.g.

from general encyclopedia and then from events:

• cities
• provinces
• countries
• fields (difficult !) from scientific events
• daterange
• ordinal

with the goal to make these valid attributes of

• event