Improve toLanguageTag()'s "und" locale handling
am: ac1a79bbc6

Change-Id: I794240265f44c1a2ea2dbe7119d9203f7ecb6b12
tree: d69b0304e667beeccf3da39e564d4992344134af
  1. app/
  2. doc/
  3. include/
  4. libs/
  5. tests/
  6. tools/
  7. .clang-format
  8. Android.bp
  9. PREUPLOAD.cfg