They're currently auto-converted to the new format, but ideally,
we wouldn't need that B/C code. And since this is the extension
others will likely look at for examples when implementing, we
should do it right here.
Also: there is no B/C correction for missing keys in secondary
links (description, icon).
Change-Id: If1a8b9911e81bb4c565f21a4b9e31fdc73426d93
Wikis can customize the 'notification-welcome-link' to a page title
(like "Project:Welcome" for example) and the "Welcome!" notification new
users receive will have a primary link to that page.
Bug: T117509
Change-Id: I29f6d69db480fa7d39573941e762c4dad8737ed0
