Add sections to every page in one ask

Zarla's editor chat now adds a section to several pages in one reply and understands every sensible way you point at a section.

Ask for a section on every location page, or on two pages at once, and the chat adds all of them in one reply. It used to stop at one page and ask you to repeat yourself, or answer that it couldn't.

Sections you had added by chat earlier could trip it up too: asking to add something right after one of them came back with "I aimed it at the wrong spot". That's fixed, along with a handful of other ways of describing where a section goes or which page to delete that the editor now understands.