[Panlingual] Revamp the panlingual UI in Settings.

- Create a Activity to contain AppLocaleDetail and
    LocalePickerWithRegion
  - Update the Entry from apps language page

Bug: 223089715
Test: local test pass
Change-Id: Id01e93f3df32412c7323ca577a149009eb1862ad
Merged-In: Id01e93f3df32412c7323ca577a149009eb1862ad

AndroidManifest.xml

@@ -851,7 +851,7 @@
         </activity>
 
         <activity
-            android:name=".Settings$AppLocalePickerActivity"
+            android:name=".localepicker.AppLocalePickerActivity"
             android:label="@string/app_locale_picker_title"
             android:exported="true" >
             <intent-filter>
@@ -859,8 +859,6 @@
                 <category android:name="android.intent.category.DEFAULT" />
                 <data android:scheme="package" />
             </intent-filter>
-            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
-                android:value="com.android.settings.applications.appinfo.AppLocaleDetails" />
         </activity>
 
         <activity