Translate label in control bar.

static/partials/youtubevideo.html

@@ -41,7 +41,7 @@
 		<div class="overlaybar-content">
 			<form class="container-fluid" role="form">
 				<div class="form-group">
-					<label for="youtubeurl">YouTube URL to share</label>
+					<label for="youtubeurl">{{_('YouTube video to share')}}</label>
 					<div class="overlaybar-input">
 						<input type="text" class="form-control input-lg" id="youtubeurl" ng-model="youtubeurl" required placeholder="{{_('YouTube URL')}}">
 						<div class="overlaybar-buttons">