Make VideoPlayer toast error message translatable

Closes https://github.com/signalapp/Signal-Android/pull/6150
// FREEBIE

Upstream commit: https://github.com/signalapp/Signal-Android/commit/9c1f7f1657a8347ea3c37612078f8fdc7507f2d0

res/values/strings.xml

@@ -460,6 +460,9 @@
     <string name="SingleRecipientNotificationBuilder_silence" translatable="false">Silence</string>
     <string name="SingleRecipientNotificationBuilder_new_message">New message</string>
 
+    <!-- VideoPlayer -->
+    <string name="VideoPlayer_error_playing_video">Error playing video</string>
+
     <!-- SubscriptionInfoCompat -->
     <string name="SubscriptionInfoCompat_slot">Slot %1$s</string>
     <string name="SubscriptionInfoCompat_display_name">%1$s (slot %2$s)</string>

src/org/smssecure/smssecure/video/VideoPlayer.java

@@ -60,7 +60,7 @@ public class VideoPlayer extends FrameLayout {
       Log.w(TAG, "Playing video directly from non-local Uri...");
       this.videoView.setVideoURI(videoSource.getUri());
     } else {
-      Toast.makeText(getContext(), "Error playing video...", Toast.LENGTH_LONG).show();
+      Toast.makeText(getContext(), getContext().getString(R.string.VideoPlayer_error_playing_video), Toast.LENGTH_LONG).show();
       return;
     }