Allow to reset language

app/src/main/java/app/fedilab/android/ui/fragment/settings/FragmentLanguageSettings.java

@@ -14,11 +14,14 @@ package app.fedilab.android.ui.fragment.settings;
  * You should have received a copy of the GNU General Public License along with Fedilab; if not,
  * see <http://www.gnu.org/licenses>. */
 
+import android.annotation.SuppressLint;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 
 import androidx.preference.ListPreference;
+import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceManager;
 
 import app.fedilab.android.R;
 import app.fedilab.android.helper.Helper;
@@ -31,16 +34,28 @@ public class FragmentLanguageSettings extends PreferenceFragmentCompat implement
         createPref();
     }
 
+    @SuppressLint("ApplySharedPref")
     private void createPref() {
         ListPreference SET_DEFAULT_LOCALE_NEW = findPreference(getString(R.string.SET_DEFAULT_LOCALE_NEW));
         if (SET_DEFAULT_LOCALE_NEW != null) {
             SET_DEFAULT_LOCALE_NEW.getContext().setTheme(Helper.dialogStyle());
         }
+
+        Preference SET_TRANSLATE_VALUES_RESET = findPreference(getString(R.string.SET_TRANSLATE_VALUES_RESET));
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(requireActivity());
+        if (SET_TRANSLATE_VALUES_RESET != null) {
+            SET_TRANSLATE_VALUES_RESET.setOnPreferenceClickListener(preference -> {
+                SharedPreferences.Editor editor = sharedPreferences.edit();
+                editor.putString(getString(R.string.SET_DEFAULT_LOCALE_NEW), null);
+                editor.commit();
+                return true;
+            });
+        }
     }
 
     @Override
     public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
-        if (key.compareToIgnoreCase(getString(R.string.SET_DEFAULT_LOCALE_NEW)) == 0) {
+        if (key.compareToIgnoreCase(getString(R.string.SET_DEFAULT_LOCALE_NEW)) == 0 || key.compareToIgnoreCase(getString(R.string.SET_TRANSLATE_VALUES_RESET)) == 0) {
             requireActivity().recreate();
             Helper.recreateMainActivity(requireActivity());
         }

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

@@ -779,6 +779,7 @@
     <string name="SET_FEATURED_TAG_ACTION" translatable="false">SET_FEATURED_TAG_ACTION</string>
     <string name="SET_RETRIEVE_METADATA_IF_URL_FROM_EXTERAL" translatable="false">SET_RETRIEVE_METADATA_IF_URL_FROM_EXTERAL</string>
 
+    <string name="SET_TRANSLATE_VALUES_RESET" translatable="false">SET_TRANSLATE_VALUES_RESET</string>
     <string-array name="SET_TRANSLATE_ENTRIES" translatable="false">
         <item>en</item>
         <item>fr</item>
@@ -978,6 +979,7 @@
     <string name="files_cache_size">File cache size</string>
     <string name="clear_cache">Clear cache</string>
     <string name="delete_cache_message">Are you sure you want to delete cache? If you have drafts with media, the attached media will be lost.</string>
+    <string name="default_system_language">Use the default system language</string>
 
     <string-array name="photo_editor_emoji" translatable="false">
         <!--  Smiles  -->

app/src/main/res/xml/pref_language.xml

@@ -11,4 +11,10 @@
         app:summary="@string/set_push_notifications"
         app:title="@string/set_change_locale"
         app:useSimpleSummaryProvider="true" />
+
+    <Preference
+        android:key="@string/SET_TRANSLATE_VALUES_RESET"
+        android:summary="@string/default_system_language"
+        android:title="@string/reset"
+        app:iconSpaceReserved="false" />
 </PreferenceScreen>