[Panlingual] Adds a filter of application for per apps locale change.

- Settings -> System -> app language -> app languages
   Use this filter to only show apps allowed to change the locale.
 - Settings -> Apps -> all apps -> any one of app -> language
   Use this filter to only show the language preference of app allowed to change the locale.
Bug: 210935436
Test: atest pass.
Test: local test.
Change-Id: I2f8a0815dae68392e11882ad9e1e4945492efdba

src/com/android/settings/applications/appinfo/AppLocalePreferenceController.java

@@ -20,20 +20,23 @@ import android.content.Context;
 import android.util.FeatureFlagUtils;
 
 import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.applications.AppLocaleUtil;
 
 /**
  * A controller to update current locale information of application.
  */
 public class AppLocalePreferenceController extends AppInfoPreferenceControllerBase {
+    private static final String TAG = AppLocalePreferenceController.class.getSimpleName();
+
     public AppLocalePreferenceController(Context context, String key) {
         super(context, key);
     }
 
     @Override
     public int getAvailabilityStatus() {
-        return FeatureFlagUtils
-                .isEnabled(mContext, FeatureFlagUtils.SETTINGS_APP_LANGUAGE_SELECTION)
-                ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+        boolean isFeatureOn = FeatureFlagUtils
+                .isEnabled(mContext, FeatureFlagUtils.SETTINGS_APP_LANGUAGE_SELECTION);
+        return isFeatureOn && canDisplayLocaleUi() ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
     }
 
     @Override
@@ -45,4 +48,8 @@ public class AppLocalePreferenceController extends AppInfoPreferenceControllerBa
     public CharSequence getSummary() {
         return AppLocaleDetails.getSummary(mContext, mParent.getAppEntry().info.packageName);
     }
+
+    boolean canDisplayLocaleUi() {
+        return AppLocaleUtil.canDisplayLocaleUi(mContext, mParent.getAppEntry());
+    }
 }