Hello. A template name isn't accessible from Xslt directly. However, you can always add some C# (or VB.NET) script to your xslt with a msxml:script element. In your case you could use something like this:

  <msxml:script language="C#" implements-prefix="script">
    <msxml:assembly name="cms"/>
    <msxml:assembly name="businesslogic"/>
    <msxml:using namespace="umbraco.cms.businesslogic.template"/>
      public string GetTemplateTextById(int id) {
        return new Template(id).Text;
      }
  </msxml:script>

and:

<xsl:value-of select="script:GetTemplateTextById($currentPage/@template)"/>