Remove Han from "Early Modern" group
rvid19 provided a PR https://github.com/freeciv/freeciv/pull/50 to remove "Han" from "Early Modern" group.
Depends on #48764 (S3_0 & S3_1)
rvid19 provided a PR https://github.com/freeciv/freeciv/pull/50 to remove "Han" from "Early Modern" group.