Convert Chinese lang codes with a region code to a compatible lang code
Convert zh-HK, zh-MO, zh-SG to their compatible language codes such as
zh-CN and zh-TW. This will help to show Translate UI on websites in
the Chinese langs with the region codes.
BUG=409606
TEST=components_unittests --gtest_filter=Language*:Translate*, unit_tests --gtest_filter=Translate*, browser_tests --gtest_filter=ChromeRenderViewTest.LanguageCommonMistakesAreCorrected
Review URL: https://codereview.chromium.org/
715593002
Cr-Commit-Position: refs/heads/master@{#303981}