Add missing image alt tags #1217

Job	Run time
get_available_profiles	5s
merge_client_pr	0s
update_client_pr (android-uploader, api.video-android-uploader)	41s
close_client_pr	0s
update_client_pr (android, api.video-android-client)	47s
update_client_pr (csharp, api.video-csharp-client)	32s
update_client_pr (go, api.video-go-client)	24s
update_client_pr (java, api.video-java-client)	50s
update_client_pr (nodejs, api.video-nodejs-client)	2m 14s
update_client_pr (php, api.video-php-client)	33s
update_client_pr (python, api.video-python-client)	42s
update_client_pr (swift5-uploader, api.video-ios-uploader)	26s
update_client_pr (swift5, api.video-ios-client)	38s
generate_documentation	12s
	8m 4s

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