Update the pre-built ICU data file for the following changes:

source/data/locales/es.txt

 // ***************************************************************************
 // *
 // * Copyright (C) 2010 International Business Machines
 // * Corporation and others.  All Rights Reserved.
 // * Tool: com.ibm.icu.dev.tool.cldr.LDML2ICUConverter.java
 // * Source File:<path>/common/main/es.xml
 // *
 // ***************************************************************************
 /**
  *  ICU <specials> source: <path>/xml/main/es.xml
@@ skipping 151 matching lines @@
                         "miércoles",
                         "jueves",
                         "viernes",
                         "sábado",
                     }
                 }
                 stand-alone{
                     narrow{
                         "D",
                         "L",
-                        "M",
+                        "X",
                         "M",
                         "J",
                         "V",
                         "S",
                     }
                 }
             }
             eras{
                 abbreviated{
                     "a.C.",
@@ skipping 483 matching lines @@
         week{
             one{"{0} semana"}
             other{"{0} semanas"}
         }
         year{
             one{"{0} año"}
             other{"{0} años"}
         }
     }
 }