Multiplayer improvements and reupload score on error

- In multiplayer you will play at the bottom if you joined second
- Add a dialog to song select that score has not been saved
- Uploads the score when logged in again
- Translate error messages from the server

public/src/js/viewassets.js

@@ -18,7 +18,7 @@ class ViewAssets{
 				sw: imgw,
 				sh: imgh - 1,
 				x: view.portrait ? -60 : 0,
-				y: view.portrait ? (view.multiplayer === 2 ? 560 : 35) : (view.multiplayer === 2 ? 360 : 2),
+				y: view.portrait ? (view.player === 2 ? 560 : 35) : (view.player === 2 ? 360 : 2),
 				w: w,
 				h: h - 1
 			}