Redesign German schema to accommodate impersonal, genitive and dative verbs

[kayernyc]

See these articles for reference:

https://german.yabla.com/lesson-The-verb-gelingen-1188
https://www.thoughtco.com/frequently-used-german-dative-verbs-4071410

Research dative structures. Consider ways to map English to these structures. Are the sets of impersonal verbs similar in French and German?

properties:
dative:
genitive:
impersonal:
reflexive;

AC:

• schema allows consumer apps to correctly map to impersonal verbs (only sie and es
• determine if this requires an update to the language types
• flag verbs as dative or accusative or both (for bivalent verbs, how to capture meaning - see variations in English?)
• flag verbs as genitive
• documentation for db_management is updated to reflect these findings.