Add /-/provinces for JH and Modify /-/countries for upstream

In jh, Should we change the api name, like https://gitlab.cn/-/regions

and the response of https://gitlab.cn/-/countries is like

[
  [
    "Afghanistan",
    "AF"
  ],
  ...
]

And what the response of https://gitlab.cn/-/regions is like? @JeremyWuuuuu

/cc @qianzhangxa