Update localizations settings

1) now, on « content language » change, it will also change the app language
2) added Esperanto to the list of language in content language

app/src/main/java/org/schabi/newpipe/MainActivity.java

@@ -67,6 +67,7 @@ import org.schabi.newpipe.fragments.list.search.SearchFragment;
 import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.util.Constants;
 import org.schabi.newpipe.util.KioskTranslator;
+import org.schabi.newpipe.util.Localization;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.PeertubeHelper;
 import org.schabi.newpipe.util.PermissionHelper;
@@ -78,6 +79,8 @@ import org.schabi.newpipe.util.ThemeHelper;
 import java.util.ArrayList;
 import java.util.List;
 
+import static org.schabi.newpipe.util.Localization.changeAppLanguage;
+
 public class MainActivity extends AppCompatActivity {
     private static final String TAG = "MainActivity";
     public static final boolean DEBUG = !BuildConfig.BUILD_TYPE.equals("release");
@@ -116,6 +119,8 @@ public class MainActivity extends AppCompatActivity {
 
         ThemeHelper.setTheme(this, ServiceHelper.getSelectedServiceId(this));
 
+        changeAppLanguage(Localization.getPreferredLocale(getApplicationContext()), getResources());
+
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 

app/src/main/java/org/schabi/newpipe/util/Localization.java

@@ -2,8 +2,11 @@ package org.schabi.newpipe.util;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.content.res.Resources;
 import android.preference.PreferenceManager;
 import android.text.TextUtils;
+import android.util.DisplayMetrics;
 
 import org.ocpsoft.prettytime.PrettyTime;
 import org.ocpsoft.prettytime.units.Decade;
@@ -216,4 +219,11 @@ public class Localization {
     public static String relativeTime(Calendar calendarTime) {
         return getPrettyTime().formatUnrounded(calendarTime);
     }
+
+    public static void changeAppLanguage(Locale loc, Resources res) {
+        DisplayMetrics dm = res.getDisplayMetrics();
+        Configuration conf = res.getConfiguration();
+        conf.setLocale(loc);
+        res.updateConfiguration(conf, dm);
+    }
 }

app/src/main/res/values/settings_keys.xml

@@ -272,6 +272,7 @@
         <item>cs</item>
         <item>da</item>
         <item>de</item>
+        <item>eo</item>
         <item>et</item>
         <item>en-GB</item>
         <item>en</item>
@@ -351,6 +352,7 @@
         <item>Čeština</item>
         <item>Dansk</item>
         <item>Deutsch</item>
+        <item>Esperanto</item>
         <item>Eesti</item>
         <item>English (UK)</item>
         <item>English (US)</item>