i18n: add setting to force English language usage of the app.

Clover/app/src/main/java/org/floens/chan/Chan.java

@@ -34,6 +34,7 @@ import org.floens.chan.core.di.UserAgentProvider;
 import org.floens.chan.core.manager.BoardManager;
 import org.floens.chan.core.site.SiteService;
 import org.floens.chan.utils.AndroidUtils;
+import org.floens.chan.utils.LocaleUtils;
 import org.floens.chan.utils.Logger;
 import org.floens.chan.utils.Time;
 
@@ -89,6 +90,8 @@ public class Chan extends Application implements UserAgentProvider, Application.
     }
 
     public void initialize() {
+        LocaleUtils.overrideLocaleToEnglishIfNeeded(this);
+
         final long startTime = Time.startTiming();
 
         registerActivityLifecycleCallbacks(this);

Clover/app/src/main/java/org/floens/chan/core/settings/ChanSettings.java

@@ -90,6 +90,7 @@ public class ChanSettings {
 
     private static Proxy proxy;
 
+    public static final BooleanSetting forceEnglishLocale;
     private static final StringSetting theme;
     public static final OptionsSetting<LayoutMode> layoutMode;
     public static final StringSetting fontSize;
@@ -162,6 +163,8 @@ public class ChanSettings {
     static {
         SettingProvider p = new SharedPreferencesSettingProvider(AndroidUtils.getPreferences());
 
+        forceEnglishLocale = new BooleanSetting(p, "preference_force_english_locale", false);
+
         theme = new StringSetting(p, "preference_theme", "yotsuba");
 
         layoutMode = new OptionsSetting<>(p, "preference_layout_mode", LayoutMode.class, LayoutMode.AUTO);

Clover/app/src/main/java/org/floens/chan/ui/activity/StartActivity.java

@@ -60,6 +60,7 @@ import org.floens.chan.ui.helper.VersionHandler;
 import org.floens.chan.ui.state.ChanState;
 import org.floens.chan.ui.theme.ThemeHelper;
 import org.floens.chan.utils.AndroidUtils;
+import org.floens.chan.utils.LocaleUtils;
 import org.floens.chan.utils.Logger;
 
 import java.util.ArrayList;
@@ -108,6 +109,8 @@ public class StartActivity extends AppCompatActivity implements NfcAdapter.Creat
             return;
         }
 
+        LocaleUtils.overrideLocaleToEnglishIfNeeded(this);
+
         ThemeHelper.getInstance().setupContext(this);
 
         imagePickDelegate = new ImagePickDelegate(this);

Clover/app/src/main/java/org/floens/chan/ui/controller/BehaviourSettingsController.java

@@ -28,6 +28,7 @@ import org.floens.chan.ui.helper.RefreshUIMessage;
 import org.floens.chan.ui.settings.BooleanSettingView;
 import org.floens.chan.ui.settings.IntegerSettingView;
 import org.floens.chan.ui.settings.LinkSettingView;
+import org.floens.chan.ui.settings.SettingView;
 import org.floens.chan.ui.settings.SettingsController;
 import org.floens.chan.ui.settings.SettingsGroup;
 import org.floens.chan.ui.settings.StringSettingView;
@@ -37,6 +38,8 @@ import de.greenrobot.event.EventBus;
 import static org.floens.chan.Chan.injector;
 
 public class BehaviourSettingsController extends SettingsController {
+    private SettingView forceEnglishSetting;
+
     public BehaviourSettingsController(Context context) {
         super(context);
     }
@@ -54,11 +57,25 @@ public class BehaviourSettingsController extends SettingsController {
         buildPreferences();
     }
 
+    @Override
+    public void onPreferenceChange(SettingView item) {
+        super.onPreferenceChange(item);
+        if (item == forceEnglishSetting) {
+            Toast.makeText(context, R.string.setting_force_english_locale_toggle_notice,
+                    Toast.LENGTH_LONG).show();
+        }
+    }
+
     private void populatePreferences() {
         // General group
         {
             SettingsGroup general = new SettingsGroup(R.string.settings_group_general);
 
+            forceEnglishSetting = general.add(new BooleanSettingView(this,
+                    ChanSettings.forceEnglishLocale,
+                    R.string.setting_force_english_locale,
+                    R.string.setting_force_english_locale_toggle_notice));
+
             general.add(new BooleanSettingView(this,
                     ChanSettings.autoRefreshThread,
                     R.string.setting_auto_refresh_thread, 0));

Clover/app/src/main/java/org/floens/chan/utils/LocaleUtils.java

@@ -0,0 +1,30 @@
+package org.floens.chan.utils;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.os.Build;
+
+import org.floens.chan.core.settings.ChanSettings;
+
+import java.util.Locale;
+
+public class LocaleUtils {
+    public static void overrideLocaleToEnglishIfNeeded(Context context) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1 &&
+                ChanSettings.forceEnglishLocale.get()) {
+            setLocaleToEnglish(context);
+        }
+    }
+
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
+    private static void setLocaleToEnglish(Context context) {
+        Resources resources = context.getResources();
+        Configuration configuration = resources.getConfiguration();
+
+        configuration.setLocale(Locale.ENGLISH);
+
+        resources.updateConfiguration(configuration, resources.getDisplayMetrics());
+    }
+}

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

@@ -459,6 +459,8 @@ Crash reports do not collect any personally identifiable information."
 
     <!-- Behavior general group -->
     <string name="settings_group_general">General</string>
+    <string name="setting_force_english_locale">Always use English for the language of the app</string>
+    <string name="setting_force_english_locale_toggle_notice">Language will be applied on the next app start.</string>
     <string name="setting_auto_refresh_thread">Auto refresh threads</string>
     <string name="setting_confirm_exit">Confirm before exit</string>
     <string name="setting_controller_swipeable">Allow screens to be swiped away</string>