AO3-6863 Update co-creator subject lines and tests #4812

Job	Run time
rake db:otwseed	1m 13s
rspec spec/controllers	13m 39s
rspec spec/models	5m 51s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	9m 9s
cucumber features/admins	6m 46s
cucumber features/bookmarks	5m 5s
cucumber features/collections	6m 19s
cucumber features/comments_and_kudos	6m 28s
cucumber features/gift_exchanges	6m 40s
cucumber features/importing	2m 48s
cucumber features/other_a	11m 29s
cucumber features/other_b	6m 53s
cucumber features/prompt_memes_a	3m 45s
cucumber features/prompt_memes_b	3m 48s
cucumber features/prompt_memes_c	4m 57s
cucumber features/search	6m 32s
cucumber features/tag_sets	3m 31s
cucumber features/tags_and_wrangling	7m 21s
cucumber features/users	5m 0s
cucumber features/works	13m 11s
	2h 10m 25s

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