Synced with wpcom as of r133501

Backbone returns success as `1` not `'1'` -- correct the comparison

This syncs over r133501-wpcom

Codebase is in sync with wpcom r133496

Merge in r133168-wpcom

Remove wpcom_filter_long_comments_on_display from checklists so they
don't break with long checklists. Props @roccotripaldi