AO3-5502 Fix page title of the adult content warning for chapters #4938

Job	Run time
rake db:otwseed	2m 15s
rspec spec/controllers	12m 45s
rspec spec/models	5m 44s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	8m 17s
cucumber features/admins	7m 0s
cucumber features/bookmarks	4m 29s
cucumber features/collections	6m 48s
cucumber features/comments_and_kudos	6m 29s
cucumber features/gift_exchanges	6m 59s
cucumber features/importing	2m 40s
cucumber features/other_a	11m 42s
cucumber features/other_b	7m 9s
cucumber features/prompt_memes_a	3m 56s
cucumber features/prompt_memes_b	3m 48s
cucumber features/prompt_memes_c	6m 24s
cucumber features/search	6m 41s
cucumber features/tag_sets	4m 20s
cucumber features/tags_and_wrangling	8m 14s
cucumber features/users	5m 13s
cucumber features/works	13m 0s
	2h 13m 53s

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