Revert "Drop rikkax"

This reverts commit 87d284ad97.

app/src/main/java/com/hippo/ehviewer/EhApplication.java

@@ -91,6 +91,8 @@ import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.Response;
 import okhttp3.ResponseBody;
+import rikka.material.app.DayNightDelegate;
+import rikka.material.app.LocaleDelegate;
 
 public class EhApplication extends SceneApplication {
 
@@ -334,6 +336,10 @@ public class EhApplication extends SceneApplication {
             EhDB.mergeOldDB(this);
         }
 
+        LocaleDelegate.setDefaultLocale(Settings.getLocale());
+        DayNightDelegate.setApplicationContext(this);
+        DayNightDelegate.setDefaultNightMode(Settings.getTheme());
+
         // Do io tasks in new thread
         //noinspection deprecation
         new AsyncTask<Void, Void, Void>() {