Ref T13130. See PHI483. Currently, "Plan Changes + Draft" uses rules like "Plan Changes", not rules like "Draft", and allows "Accept".

This isn't consistent with how "Draft" and "Accept" work in other cases. Make "Plan Changes + Draft" more like "Draft" for consistency.

Also fix a string that didn't have a natural English version.

• Added a failing build plan.
• Created a revision.
• Loaded the revision before builds completed, saw a nicer piece of text about "waiting for builds" instead of "waiting for 2 build(s)".
• Builds failed, which automatically demoted the reivsion to "Changes Planned + Draft".
• As the author and as a reviewer, verified all the actions available to me made sense (particularly, no "Accept").
• Abandoned the revision to test "Abandoned + Draft".
• As the author and as a reviewer, verified all the actions available to me made sense.
• Reclaimed the revision, then used "Request Review" to send it to "Needs Review". Verified that actions made sense and, e.g., reviewers could now "Accept" normally.