Correct Mauryans into Mauryas.
The name of the faction is the dynasty name "Maurya". The plural should be "Maurya" as well, but "Mauryas" is commonly accepted and less likely to confuse people. On the other hand, "Mauryan" is the adjective, and cannot get a plural mark in English.
All instances of "Mauryans" were removed, including in file names and paths.
Patch By: Nescio
Differential Revision: https://code.wildfiregames.com/D1342