Map Simplified Chinese (zh-hans) to zh default

In the Android app we have sym links for the two most
common Traditional Chinese variants (zh-rHK to zh-rTW)
but Simplified Chinese is simpler to solve by making it
the default for zh. It's the lesser evil than falling back
to English.

Bug: 69304
Change-Id: I929072a69d39145cb9303e8d12ae6e927c7c2906
Merge "Map Simplified Chinese (zh-hans) to zh default"