[Added] Showing custom nicks for Tab Complete in Commands: /tp, /msg, /tell, /w, /give, /enchant and /advancement
[Added] Custom nicks now shows in advancement messages, if you have announcing advancements set to false.
[Added] In nicknames.yml you can set custom advancement messages to false. (After that all advancement messages wont show up).

[Know Issue] Advancements doesnt show the descriptions.