Fix display for current language on change

src/less/components/captions.less

@@ -16,6 +16,7 @@
     padding: @plyr-control-spacing;
     transform: translateY(-(@plyr-control-spacing * 4));
     transition: transform 0.4s ease-in-out;
+    animation: plyr-fade-in 0.3s ease;
     color: @plyr-captions-color;
     font-size: @plyr-font-size-captions-small;
     text-align: center;

src/less/lib/animation.less

@@ -19,3 +19,13 @@
         opacity: 1;
     }
 }
+
+@keyframes plyr-fade-in {
+    from {
+        opacity: 0;
+    }
+
+    to {
+        opacity: 1;
+    }
+}