Fix typo

Author: steve-s

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/locale/PythonLocale.java

@@ -138,7 +138,7 @@ public static PythonLocale initializeFromTruffleEnv(Env env) {
 
         Locale displayLocale = LocaleUtils.fromPosix(defaultLangOption, null);
         if (displayLocale == null) {
-            LOGGER.warning(() -> "Could not parse the value of --python.DefaultLocale='" + defaultLangOption + '\'');
+            LOGGER.warning(() -> "Could not parse the value of --python.InitialLocale='" + defaultLangOption + '\'');
             return fromJavaDefault();
         } else {
             LOGGER.fine(() -> "Selected locale: " + displayLocale);