Increased username max length

web/react/utils/constants.jsx

@@ -461,7 +461,7 @@ export default {
     },
     OVERLAY_TIME_DELAY: 400,
     MIN_USERNAME_LENGTH: 3,
-    MAX_USERNAME_LENGTH: 15,
+    MAX_USERNAME_LENGTH: 64,
     MIN_PASSWORD_LENGTH: 5,
     MAX_PASSWORD_LENGTH: 50,
     TIME_SINCE_UPDATE_INTERVAL: 30000