Fix Data warning title not translated.

- change to use the title resource id instead of getting the title from
the preference, so that it can react to language change properly.

Change-Id: I7f4b3c49ef1622b3d90bf035597742cac6f7af3c
Fixes: 78318536
Test: run i18nscreenshots

src/com/android/settings/datausage/BillingCyclePreference.java

@@ -88,7 +88,7 @@ public class BillingCyclePreference extends Preference implements TemplatePrefer
         return new SubSettingLauncher(getContext())
                 .setDestination(BillingCycleSettings.class.getName())
                 .setArguments(args)
-                .setTitle(getTitle())
+                .setTitle(R.string.billing_cycle)
                 .setSourceMetricsCategory(MetricsProto.MetricsEvent.VIEW_UNKNOWN)
                 .toIntent();
     }