add launcher update check

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

@@ -25,6 +25,8 @@
     <string name="launcher_unsupported_version_description">
         The current version of Geometry Dash is not compatible with the version supported by the launcher (%2$s). A launcher update is required to fix this.\nLaunch will continue, but crashes may occur!
     </string>
+    <string name="launcher_update_available">A new launcher update is available!</string>
+    <string name="launcher_update_dismiss">Dismiss</string>
 
     <!-- Updater strings -->
     <string name="release_fetch_failed">Update failed.\n%1$s</string>