String changes for pirut to add error messages

[Jeremy Katz]

This is a request to break the string freeze for pirut to add some error
messages when handling repo editing.  Not doing so means we either need
to 
  a) rip out the capability
  b) not handle errors
  c) only give a generic "Error" type of thing rather than useful error
messages
  d) don't mark the strings for translation and have them show up in
English only

None of which feel all that right to me.  So sound reasonable?

Jeremy