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add an option to show the credits of the media (copyrights for example).
The credit is catched from the dcterms:rightsHolder property value of the media.
Hyperlinking when possible.
option has to be implemented as a themeSetting in 'media-caption' by the themes.
PS: its a PR to you and not a Theme Helper because (I don't know why) the theme helper for light gallery is not used, and directly the application helper is used.