fix: lesson youtube video issue

frontend/src/components/LessonContent.vue

@@ -2,7 +2,7 @@
 	<div v-if="youtube">
 		<iframe
 			class="youtube-video"
-			:src="getYouTubeVideoSource(youtube)"
+			:src="getYouTubeVideoSource(youtube.split('/').pop())"
 			width="100%"
 			height="400"
 			frameborder="0"
@@ -54,6 +54,7 @@
 		</div>
 		<div v-else v-html="markdown.render(block)"></div>
 	</div>
+	{{ quizId }}
 	<div v-if="quizId">
 		<Quiz :quiz="quizId" />
 	</div>

frontend/src/components/Quiz.vue

@@ -27,7 +27,7 @@
 			<div v-if="quiz.doc.time" class="leading-relaxed">
 				{{
 					__(
-						'The quiz has a time limit.For each question you will be given { 0} seconds.'
+						'The quiz has a time limit.For each question you will be given {0} seconds.'
 					).format(quiz.doc.time)
 				}}
 			</div>