Media: Clarify caption field labels for images and videos #35353

Job	Run time
Determine Matrix	3s
Single Site Memcached / Test before	14m 2s
Multisite Memcached / Test current	14m 2s
Multisite Default / Test current	14m 9s
Multisite Memcached / Test before	14m 1s
Single Site Memcached / Test current	14m 1s
Single Site Default / Test before	13m 0s
Single Site Default / Test current	14m 5s
Multisite Default / Test before	13m 38s
Compare / Single Site Memcached	11s
Compare / Single Site Default	11s
Compare / Multisite Default	16s
Compare / Multisite Memcached	14s
Slack Notifications	0s
Failed workflow tasks	-1s
	1h 51m 52s

Provide feedback