Merge branch 'ab/ambiguous-object-name'

Error output given in response to an ambiguous object name has been
improved.

* ab/ambiguous-object-name:
  object-name: re-use "struct strbuf" in show_ambiguous_object()
  object-name: iterate ambiguous objects before showing header
  object-name: show date for ambiguous tag objects
  object-name: make ambiguous object output translatable
  object-name: explicitly handle bad tags in show_ambiguous_object()
  object-name: explicitly handle OBJ_BAD in show_ambiguous_object()
  object-name tests: add tests for ambiguous object blind spots

diff --cc object-name.c
Simple merge

diff --cc t/t1512-rev-parse-disambiguation.sh
Simple merge