FIXED Complete rewrite of the custom lang loader system - this should fix all menus that were previously having issues with loading custom itemnames and itemlores.

IMPROVED Lang files are now split. All files are in folder "lang" with messages in messages.yml and all menus having their own file in "menus".
IMPROVED Users can now filter their /market myshops page by stock, price, profit etc.

NEW Option for stacking permissions (inheriting higher limits via permissions for maxshops and maxstacksize)
NEW Command /market mystats to see list of stats including shop limits etc