Some string changes from lqa testing

* Send new... -> Send label
* Define customized view -> Customize view
* Choose contact shortcut ->
  Choose a number to call ->
  Choose a number to message -> Choose contact

Test: unit tests/visual inspection of new strings
Bug: 33430132
Bug: 33248117
Bug: 33209156
Change-Id: I05e4f74d9c5f01336b641571445b6e2b5293359d