[Regional Preferences] Remove u extension for subtitle of Language

- Remove the language tag info of subtitle in  Settings -> System -> Languages
 - Syuc same result to entry of numbering system.

Bug: b/268278327
Bug: b/268276472
Test: atest passed
Test: Manual test passed
Change-Id: I46dd0899059e9209b99f5ef3b7b84eb083d4e140

src/com/android/settings/localepicker/LocaleFeatureProviderImpl.java

@@ -27,10 +27,16 @@ public class LocaleFeatureProviderImpl implements LocaleFeatureProvider {
     @Override
     public String getLocaleNames() {
         final LocaleList locales = LocalePicker.getLocales();
+        Locale[] arrLocalesWithoutExtension = new Locale[locales.size()];
+        for (int i = 0; i < locales.size(); i++) {
+            arrLocalesWithoutExtension[i] = locales.get(i).stripExtensions();
+        }
         final Locale displayLocale = Locale.getDefault();
         return LocaleHelper.toSentenceCase(
                 LocaleHelper.getDisplayLocaleList(
-                        locales, displayLocale, 2 /* Show up to two locales from the list */),
+                        new LocaleList(arrLocalesWithoutExtension),
+                        displayLocale,
+                        2 /* Show up to two locales from the list */),
                 displayLocale);
     }
 }

src/com/android/settings/regionalpreferences/NumberingSystemController.java

@@ -17,12 +17,9 @@
 package com.android.settings.regionalpreferences;
 
 import android.content.Context;
-import android.os.LocaleList;
 
 import com.android.settings.core.BasePreferenceController;
-
-import java.util.Locale;
-import java.util.StringJoiner;
+import com.android.settings.localepicker.LocaleFeatureProviderImpl;
 
 /** A controller for the entry of Numbering System's page */
 public class NumberingSystemController extends BasePreferenceController {
@@ -50,12 +47,6 @@ public class NumberingSystemController extends BasePreferenceController {
 
     @Override
     public CharSequence getSummary() {
-        LocaleList localeList = LocaleList.getDefault();
-        StringJoiner stringJoiner = new StringJoiner(", ");
-        for (int i = 0; i < localeList.size(); i++) {
-            Locale locale = localeList.get(i);
-            stringJoiner.add(locale.stripExtensions().getDisplayName(locale));
-        }
-        return stringJoiner.toString();
+        return new LocaleFeatureProviderImpl().getLocaleNames();
     }
 }