AO3-5502 Fix page title of the adult content warning for chapters #4940

Job	Run time
rake db:otwseed	1m 15s
rspec spec/controllers	13m 0s
rspec spec/models	5m 25s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	8m 56s
cucumber features/admins	7m 38s
cucumber features/bookmarks	4m 41s
cucumber features/collections	7m 15s
cucumber features/comments_and_kudos	7m 9s
cucumber features/gift_exchanges	6m 57s
cucumber features/importing	2m 54s
cucumber features/other_a	10m 45s
cucumber features/other_b	6m 41s
cucumber features/prompt_memes_a	4m 50s
cucumber features/prompt_memes_b	3m 43s
cucumber features/prompt_memes_c	4m 59s
cucumber features/search	6m 31s
cucumber features/tag_sets	3m 11s
cucumber features/tags_and_wrangling	7m 2s
cucumber features/users	5m 13s
cucumber features/works	13m 42s
	2h 11m 47s

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