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