forpro-vis/wp2: Clean up the Prop names and unify naming for refactored Lecturer Flashcard part

[becknik]

During the restructuring of the LecturerFlashcard part of the app I didn't follow clear naming conventions for all props/ types created. E.g. the Assessment types Item sometimes is called ambiguous along the component tree.

One strict read-though to norm all the properties/ types/ (state) variable names would be nice - but I think the code should be understandable if the domain model is clear