Code review comment for lp:~mbp/launchpad/flags-gui

I'm going to do one more change here, which is to consider unifying
the view and edit pages, which will also fix an issue of a useless
"submit" button appearing on the view page, and perhaps will remove
some unnecessary repetition. Then I think this is ready to land; more
can be done both in UI and other aspects of flags but this is an
incremental improvement.