Find and replace month names

Dear all, I have a few eps files in which month-year format is written like May-12, June-13 etc. I want to change May to Mai, June to Juin etc.

Virender

var myDoc = app.activeDocument;

for (i = 0; i < myDoc.textFrames.length; i++ )

{

     var textArt = myDoc.textFrames[i];

     for (j =0; j < textArt.words.length; j++ )

     {

      var word = textArt.words[j];

     switch (word.contents)

     {

     case "May-\d\d":    // please advise here

            word.contents = "Mai";

        break;

     case "Mar-\d\d":

            word.contents = "Mrz";

        break;

     case "June-\d\d":

            word.contents = "Juin";

        break;

     }

    }

}

alert("Done");