Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 47088)
+++ wp-includes/script-loader.php	(working copy)
@@ -989,6 +989,7 @@
 						'mejs.fullscreen-on'       => __( 'Go Fullscreen' ),
 						'mejs.download-video'      => __( 'Download Video' ),
 						'mejs.fullscreen'          => __( 'Fullscreen' ),
+						/* translators: %1: Number of seconds. */
 						'mejs.time-jump-forward'   => array( __( 'Jump forward 1 second' ), __( 'Jump forward %1 seconds' ) ),
 						'mejs.loop'                => __( 'Toggle Loop' ),
 						'mejs.play'                => __( 'Play' ),
@@ -996,6 +997,7 @@
 						'mejs.close'               => __( 'Close' ),
 						'mejs.time-slider'         => __( 'Time Slider' ),
 						'mejs.time-help-text'      => __( 'Use Left/Right Arrow keys to advance one second, Up/Down arrows to advance ten seconds.' ),
+						/* translators: %1: Number of seconds. */
 						'mejs.time-skip-back'      => array( __( 'Skip back 1 second' ), __( 'Skip back %1 seconds' ) ),
 						'mejs.captions-subtitles'  => __( 'Captions/Subtitles' ),
 						'mejs.captions-chapters'   => __( 'Chapters' ),
@@ -1008,6 +1010,7 @@
 						'mejs.video-player'        => __( 'Video Player' ),
 						'mejs.audio-player'        => __( 'Audio Player' ),
 						'mejs.ad-skip'             => __( 'Skip ad' ),
+						/* translators: %1: Number of seconds. */
 						'mejs.ad-skip-info'        => array( __( 'Skip in 1 second' ), __( 'Skip in %1 seconds' ) ),
 						'mejs.source-chooser'      => __( 'Source Chooser' ),
 						'mejs.stop'                => __( 'Stop' ),