limit printed menu text to max 18 characters

Firmware/menu.cpp

@@ -171,7 +171,7 @@ int menu_draw_item_printf_P(char type_char, const char* format, ...)
 static int menu_draw_item_puts_P(char type_char, const char* str)
 {
     lcd_set_cursor(0, menu_row);
-	int cnt = lcd_printf_P(PSTR("%c%-18S%c"), (lcd_encoder == menu_item)?'>':' ', str, type_char);
+    int cnt = lcd_printf_P(PSTR("%c%-18.18S%c"), (lcd_encoder == menu_item)?'>':' ', str, type_char);
 	return cnt;
 }