MBS-6990: Do not open release recordings in new tabs

entity.js previously had 'target="_blank"' hard coded into its
templating. The html() functions have now been extended to take a
'renderParams' argument, where the user can provide the 'target' key to
specify the value of this attribute. All html() calls in the
relationship editor now provide { target: "_blank" }, while the release
page does not use this.