Module sentence 

History entries as sentences for the person reading this app’s history: in their locale, from the app’s catalogue on this thread and the labels of the actions it publishes.

Functions

learn_field_titles

Remember the titles of the fields shape lays out (and those of its nested records and items), so entries name a field by its title.

learn_labels

Remember the labels of the actions resources publish, as the app words them in the reader’s language, so entries naming them read the same.

sentence

The sentence for one entry.

step_summary

What a history row says about one change: what it did, else what its actor said they were doing. None when the entry says neither.

with_reader

Run read with a reader in this thread’s locale and catalogues.