iOS Changes

Supporting iOS is just as important to the Flutter team as support Android, which you can see in the huge volume of changes we’ve made in this release to make the iOS experience even better.

flutter#29200: Cupertino localization step 1: add an English arb file

flutter#29821: Cupertino localization step 1.5: fix a resource mismatch in cupertino_en.arb

flutter#30160: Cupertino localization 1.9: add needed singular resource for cupertino_en.arb

flutter#29644: Cupertino localization step 3: in-place move some material tools around to make room for cupertino

flutter#29650: Cupertino localization step 4: let generated date localization combine material and cupertino locales