The (original context variable names) context[topic+'_fields'] where topic is in ['phonology', 'semantics', 'main']
have been streamlined.
But the filling in the context is left in the spin-off branch for public so it is clear which fields are being omitted for public view, instead of burying this inside a new, shared called function with a "is_public" extra parameter to distnguish the two branches in the code.

Because the Edit branch needs additional context. This has been split off into separate code in order to make the "topics" code more concise. Specifically, the "choice lists" that used to be inside of this code are now in a separate new function. The used to be nested inside the original "topics" loop. Now this is in a separate function that yields a nested dictionary.