add message box string

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

@@ -15,6 +15,9 @@
         <item quantity="other">Automatically launching game in %1$d seconds.</item>
     </plurals>
 
+    <!-- GeometryDashActivity strings -->
+    <string name="message_box_accept">Ok</string>
+
     <!-- Preference keys -->
     <string name="preference_file_key">GeodeLauncherPreferencesFileKey</string>
     <string name="preference_load_testing">PreferenceLoadTesting</string>