Fix "no language" subtype name (DO NOT MERGE)

* Move SubtypeLocale.get{Full,Middle,Short}DisplayName() to
  LatinLeyboardView and add unit tests (SpacebarTextTests).
* Add SubtypeLocale.getSubtypeDisplayName()

This is a cherry-pick of I57420c6a from Master.

Bug: 6393865
Change-Id: I68748189c17c73984ac4ae05a5a40fb54bf46453
10 files changed
tree: 320d2e6c6429eded514f9c1c75f422d53c47ecee
  1. dictionaries/
  2. java/
  3. native/
  4. tests/
  5. tools/
  6. Android.mk
  7. CleanSpec.mk