Fix VTT formatting on Chapters page #965

Job	Run time
get_available_profiles	6s
close_client_pr	0s
update_client_pr (android-uploader, api.video-android-uploader)	40s
update_client_pr (android, api.video-android-client)	1m 1s
update_client_pr (csharp, api.video-csharp-client)	37s
update_client_pr (documentation, api.video-documentation)	1m 5s
update_client_pr (go, api.video-go-client)	27s
update_client_pr (java, api.video-java-client)	1m 10s
update_client_pr (nodejs, api.video-nodejs-client)	53s
update_client_pr (php, api.video-php-client)	21s
update_client_pr (python, api.video-python-client)	27s
update_client_pr (swift5-uploader, api.video-ios-uploader)	19s
update_client_pr (swift5, api.video-ios-client)	31s
merge_client_pr	0s
	7m 37s

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