The "Ranks (as Levels)" is a plugin which changes the rank names for example:
-"Isolated Dwelling" (which is the 0th rank) being changed as "Level 0".
-"Hamlet" (which is the 1st rank) being changed as "Level 1".
-"Small Village" (which is the 2nd rank) being changed as "Level 2".
-"Village" (which is the 3rd rank) being changed as "Level 3".
-"Big Village" (which is the 4th rank) being changed as "Level 4".
-and more until the 64th rank.
Except these, the "Rank" being renamed as "Level".
If you have questions about this plugin, feel free to comment here!