Fix strings for certificate installation in Settings

Certificates privacy page
* Changed 'Your privacy is at risk' to
  'Your data won't be private'.
* Change 'information' to 'data'.
* Changed 'Install anyways' to
  'Install anyways'.

Can't install certificate dialog
* Changed 'Can't install certificates'
  to 'Can't use this file'.

Bug: 151303108
Test: Manual testing
Change-Id: Ia66ff7210ae77204fa2e59f3264f5c799cc47436