Update preference screen title.

- Add missing title to preference screen xml so that they will be used to
set the activity title when the fragment is launched.
- Also updated some incorrect preference screen titles.
- Overrides getTitle() in preference fragments that do not use the
preference screen xml.

Bug: 64564191
Test: blaze-bin/screenshots/android/i18nscreenshots/i18nscreenshots
Change-Id: Id72d5ddf18f0962bc484de8bbd847a2e55d6371e

src/com/android/settings/applications/PictureInPictureSettings.java

@@ -147,7 +147,9 @@ public class PictureInPictureSettings extends EmptyTextSettings {
         mPackageManager = new PackageManagerWrapper(mContext.getPackageManager());
         mUserManager = new UserManagerWrapper(mContext.getSystemService(UserManager.class));
         mIconDrawableFactory = IconDrawableFactory.newInstance(mContext);
-        setPreferenceScreen(getPreferenceManager().createPreferenceScreen(mContext));
+        if (!usePreferenceScreenTitle()) {
+            setPreferenceScreen(getPreferenceManager().createPreferenceScreen(mContext));
+        }
     }
 
     @Override
@@ -198,6 +200,11 @@ public class PictureInPictureSettings extends EmptyTextSettings {
         setEmptyText(R.string.picture_in_picture_empty_text);
     }
 
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.picture_in_picture_settings;
+    }
+
     @Override
     public int getMetricsCategory() {
         return MetricsEvent.SETTINGS_MANAGE_PICTURE_IN_PICTURE;