add load testing preference

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

@@ -2,4 +2,7 @@
     <string name="app_name">Geode</string>
     <string name="title_activity_geometry_dash">GeometryDash</string>
     <string name="failed_mod_core">Failed to load mod core.</string>
+    <string name="no_activity_found">No activity found for this action.</string>
+    <string name="preference_file_key">GeodeLauncherPreferencesFileKey</string>
+    <string name="preference_load_testing">PreferenceLoadTesting</string>
 </resources>