Initial transcription support

client/components/player/TranscriptionLine.vue

@@ -0,0 +1,29 @@
+<template>
+  <div :class="{ 'text-warning': isActive }">
+    <div v-html="cue.text"></div>
+  </div>
+</template>
+
+<script>
+export default {
+  props: {
+    cue: VTTCue
+  },
+  data() {
+    return {
+      isActive: false
+    };
+  },
+  created() {
+    this.cue.onenter = () => (this.isActive = true);
+    this.cue.onexit = () => (this.isActive = false);
+  },
+  watch: {
+    isActive(newVal) {
+      if (newVal) {
+        this.$el.scrollIntoView({behavior: 'smooth'});
+      }
+    }
+  }
+};
+</script>