Added a new feature that allows players to select their prefix in chat. Do /rank prefix to open up a new GUI. There, players can select a prefix from the ranks they have completed, or they can choose to follow a rank path.
List of changes:

• Added new GUI in gui.yml
• Added a few custom items for the new GUI
• Added /rank prefix <path/reset> <rank/#> command
• Fixed a bug where the console would show dark gray chat after someone messaged
• Added 4 new messages in language.yml
• Changed the prefix placeholder to %notranks_prefix% and it is actually useful now

Thanks to AngelicMonk on discord for making me code this update. I knew it was something I would have to do in the future, but at the time I was procrastinating. If you see any bugs, let me know in the discord. It would be greatly appreciated!