Get the player object with player's uuid.
ZabriPlayer player = CraftSearch.getInstance().getPlayer(uuid);
See also: ZabriPlayer.java on GitHub
With the LTS API, you can get the player language to translate your message in it.
Lang lang = player.getLang();
You can also change the player language.
You can get player grade on CraftSearch.
Grade grade = player.getGrade();
See also: Grade.java on GitHub
You can get the current server id of a player. (the server where the player is currently connected)
String serverid = player.getCurrentServer();
You can send a player between servers with ConnectSwitcher.
serverid is a string that is your server id (you can find it at end of description in CraftSearch menu)