Index: src/wp-includes/media-template.php
===================================================================
--- src/wp-includes/media-template.php	(revision 32974)
+++ src/wp-includes/media-template.php	(working copy)
@@ -1196,7 +1196,7 @@
 							content += track.outerHTML; #>
 						<p>
 							<input class="content-track" type="text" value="{{ track.outerHTML }}" />
-							<button type="button" class="button-link remove-setting remove-track"><?php _ex( 'Remove video track', 'media' ); ?></button>
+							<button type="button" class="button-link remove-setting remove-track"><?php _e( 'Remove video track' ); ?></button>
 						</p>
 						<# } ); #>
 					<# } else { #>