Update button strings for new design

Updates the positive button strings see
mocks here:

https://screenshot.googleplex.com/6hLciwYTPMsYytt
https://screenshot.googleplex.com/ASAotxvEHnrDodq

Implementation:

https://hsv.googleplex.com/4658122816749568
https://hsv.googleplex.com/5590705238966272

Bug: 322074376
Change-Id: I8488d4b9414448bfbfc9462fe5450681bfbbfbdb
Test: flash device

src/com/android/settings/applications/defaultapps/DefaultAppPickerFragment.java

@@ -138,11 +138,15 @@ public abstract class DefaultAppPickerFragment extends RadioButtonPickerFragment
             final Bundle bundle = getArguments();
             final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
                     .setMessage(bundle.getCharSequence(EXTRA_MESSAGE))
-                    .setPositiveButton(android.R.string.ok, this)
+                    .setPositiveButton(getPositiveButtonText(), this)
                     .setNegativeButton(android.R.string.cancel, mCancelListener);
             return builder.create();
         }
 
+        protected CharSequence getPositiveButtonText() {
+            return getContext().getString(android.R.string.ok);
+        }
+
         @Override
         public void onClick(DialogInterface dialog, int which) {
             final Fragment fragment = getTargetFragment();