Cleanup account name, user name, and summary

* In AccountSetupNames:
  * Add "Field required" error tag to Names display
* In AccountSettings:
  * Improve IME behavior in text fields - auto-capitalization
  * Prevent empty username
  * Reset empty nickname back to default (email address)
  * Fix broken hint for signature
* Proper trimming in all fields

Bug: 3338435
Change-Id: I2720c4524303ada6dd228866756fc9c3aac173f3
1 file changed