AO3-2898 Update character count when using the Rich Text editor #4982

Job	Run time
rake db:otwseed	1m 9s
rspec spec/controllers	14m 3s
rspec spec/models	5m 37s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	9m 0s
cucumber features/admins	7m 35s
cucumber features/bookmarks	5m 24s
cucumber features/collections	6m 51s
cucumber features/comments_and_kudos	6m 42s
cucumber features/gift_exchanges	7m 25s
cucumber features/importing	2m 39s
cucumber features/other_a	11m 20s
cucumber features/other_b	6m 23s
cucumber features/prompt_memes_a	4m 3s
cucumber features/prompt_memes_b	4m 1s
cucumber features/prompt_memes_c	5m 0s
cucumber features/search	6m 57s
cucumber features/tag_sets	3m 13s
cucumber features/tags_and_wrangling	6m 52s
cucumber features/users	5m 15s
cucumber features/works	13m 21s
	2h 12m 50s

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