Allow administrators to edit the "Account" panel for mailing lists and bots
Summary:
Ref T8387. Ref T6367. This allows selection of a language, which will be respected in email delievered to the list users.
For example, you could have a German list that gets mail in German or something. I don't know that the feature is really useful, it's mostly just for completeness.
I also supported it for bots, mostly so their pronouns can be configured.
Test Plan:
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D13136