Previously, the i18n listeners were keyed off the text locales of the
TextView. This could create some unanticipated backward
compatibility headaches. The IME hint locales seems to be a better
match, since they are supposed to be used for input.
Fixes: 37249649
Fixes: 37133729
Fixes: 37222714
Bug: https://code.google.com/p/android/issues/detail?id=2626
Bug: 8319249
Bug: 33276673
Bug: 34394455
Bug: 37160895
Test: Updated and added CTS tests pass
Change-Id: If8a115f3e30ff1601dee426a504984e2ce24a776
e740fd8d7b