Add support for multi body in message with lang definition.

src/xmpp/stanza.go

@@ -73,9 +73,10 @@ type Message struct {
 	To      string        `xml:"to,attr,omitempty"`
 	From    string        `xml:"from,attr,omitempty"`
 	Subject string        `xml:"subject,omitempty"`
-	Body    string   `xml:"body,omitempty"`
+	Body    []MessageBody `xml:"body,omitempty"`
 	Thread  string        `xml:"thread,omitempty"`
 	Error   *Error        `xml:"error"`
+	Lang    string        `xml:"xml:lang,attr,omitempty"`
 
 	Confir *Confirm `xml:"confirm"` // XEP-0070
 
@@ -86,6 +87,11 @@ type Message struct {
 	Gone      *Gone      `xml:"gone"`      // XEP-0085
 }
 
+type MessageBody struct {
+	Lang  string `xml:"xml:lang,attr,omitempty"`
+	Value string `xml:",innerxml"`
+}
+
 // XMPP <presence/> stanza.
 type Presence struct {
 	XMLName xml.Name `xml:"presence"`