UltraLCD enhancements (lower fan resolution, backlash menu) (#13519)

Marlin/src/lcd/language/language_en.h

@@ -1386,3 +1386,13 @@
 #ifndef MSG_SERVICE_IN
   #define MSG_SERVICE_IN                      _UxGT(" in:")
 #endif
+
+#ifndef MSG_BACKLASH
+  #define MSG_BACKLASH                        _UxGT("Backlash")
+#endif
+#ifndef MSG_BACKLASH_CORRECTION
+  #define MSG_BACKLASH_CORRECTION             _UxGT("Correction")
+#endif
+#ifndef MSG_BACKLASH_SMOOTHING
+  #define MSG_BACKLASH_SMOOTHING              _UxGT("Smoothing")
+#endif