Android/iOS do not use Language/Script names except for zh*, Han*
and a few others. There's no need to have a complex lang display
name rules.

Reduce ios/icudtl.dat 2.1K by removing
 Languages%short
 Languages%variant
 Scripts%short
 Scripts%variant



Bug: 951636
Change-Id: I590c41bf68652d8d99bedd035a7fded3210533a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/1565281


Reviewed-by: Jungshik Shin <jshin@chromium.org>