Added contentDescription containing 'button' via formatters for screen readers (EXPOSUREAPP-1542) (#794)

* Update TracingViewModel.kt

* Update TracingViewModel.kt

* Added the word 'Button' to various contentDescriptions via formatters

Added the word 'Button' to various contentDescriptions via formatters specifically for  content without focusable subcontent that are explored by touch

* Update FormatterSettingsHelper.kt

* removed space in strings file and included in formatter instead

* Added formatter tests

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>