Now we could use package chat to translate in many language.

But you must call chat.SetLanguage now.
(or just import _ "github.com/Tnze/go-mc/data/lang/en-us"

chat/chatMsg.go

@@ -1,3 +1,11 @@
+// Package chat implements Minecraft's chat message encoding system.
+//
+// The type Message is the Minecraft chat message. Can be encode as JSON
+// or net/packet.Field .
+//
+// It's very recommended that use SetLanguage before using Message.String or Message.ClearString,
+// or the translate message will be ignore.
+// Note: The package of data/lang/... will SetLanguage on theirs init() so you don't need do again.
 package chat
 
 import (
@@ -7,7 +15,6 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/Tnze/go-mc/data"
 	pk "github.com/Tnze/go-mc/net/packet"
 )
 
@@ -102,22 +109,31 @@ var colors = map[string]string{
 	"white":        "97",
 }
 
-// ClearString return the message without escape sequence for ansi color.
+// translateMap is the translation table.
+// By default it's a void map.
+var translateMap = map[string]string{}
+
+// SetLanguage set the translate map to this map.
+func SetLanguage(trans map[string]string) {
+	translateMap = trans
+}
+
+// ClearString return the message String without escape sequence for ansi color.
 func (m Message) ClearString() string {
 	var msg strings.Builder
 	text, _ := trans(m.Text, false)
 	msg.WriteString(text)
 
 	//handle translate
-	if m.Translate != "" {
+	if m.Translate != "" && translateMap != nil {
+
 		args := make([]interface{}, len(m.With))
 		for i, v := range m.With {
 			var arg Message
 			_ = arg.UnmarshalJSON(v) //ignore error
 			args[i] = arg.ClearString()
 		}
-
-		_, _ = fmt.Fprintf(&msg, data.EnUs[m.Translate], args...)
+		_, _ = fmt.Fprintf(&msg, translateMap[m.Translate], args...)
 	}
 
 	if m.Extra != nil {
@@ -129,8 +145,8 @@ func (m Message) ClearString() string {
 }
 
 // String return the message string with escape sequence for ansi color.
-// On windows, you may want print this string using
-// github.com/mattn/go-colorable.
+// To convert Translated Message to string, you must set
+// On windows, you may want print this string using github.com/mattn/go-colorable.
 func (m Message) String() string {
 	var msg, format strings.Builder
 	if m.Bold {
@@ -156,7 +172,8 @@ func (m Message) String() string {
 	msg.WriteString(text)
 
 	//handle translate
-	if m.Translate != "" {
+	if m.Translate != "" && translateMap != nil {
+
 		args := make([]interface{}, len(m.With))
 		for i, v := range m.With {
 			var arg Message
@@ -164,7 +181,7 @@ func (m Message) String() string {
 			args[i] = arg
 		}
 
-		_, _ = fmt.Fprintf(&msg, data.EnUs[m.Translate], args...)
+		_, _ = fmt.Fprintf(&msg, translateMap[m.Translate], args...)
 	}
 
 	if m.Extra != nil {

chat/chatMsg_test.go

@@ -1,9 +1,12 @@
-package chat
+package chat_test
 
 import (
 	"bytes"
-	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/Tnze/go-mc/chat"
 	"testing"
+
+	_ "github.com/Tnze/go-mc/data/lang/en-us"
+	pk "github.com/Tnze/go-mc/net/packet"
 )
 
 /*
@@ -63,8 +66,9 @@ var ctexts = []string{
 }
 
 func TestChatMsgFormatString(t *testing.T) {
+
 	for i, v := range jsons {
-		var cm Message
+		var cm chat.Message
 		err := cm.UnmarshalJSON([]byte(v))
 		if err != nil {
 			t.Error(err)
@@ -77,19 +81,21 @@ func TestChatMsgFormatString(t *testing.T) {
 
 func TestChatMsgClearString(t *testing.T) {
 	for i, v := range jsons {
-		var cm Message
+		var cm chat.Message
 		err := cm.UnmarshalJSON([]byte(v))
 		if err != nil {
 			t.Error(err)
 		}
-		if str := cm.ClearString(); str != ctexts[i] {
+
+		str := cm.ClearString()
+		if str != ctexts[i] {
 			t.Errorf("gets %q, wants %q", str, texts[i])
 		}
 	}
 }
 
 func TestMessage_Encode(t *testing.T) {
-	codeMsg := Message{Translate: "multiplayer.disconnect.server_full"}.Encode()
+	codeMsg := chat.Message{Translate: "multiplayer.disconnect.server_full"}.Encode()
 
 	var msg pk.Chat
 	if err := msg.Decode(bytes.NewReader(codeMsg)); err != nil {

data/lang/en-us/en_us.go

@@ -1,10 +1,11 @@
-package data
+package en_us
 
-//TODO: check updates en_us translation
+import "github.com/Tnze/go-mc/chat"
 
-// EnUs , the default language translate data
-// When update this data, replace "%[0-9]\$s" with "%[0-9]s"
-var EnUs = map[string]string{
+func init() { chat.SetLanguage(Map) }
+
+// Map is the translate map of en-us
+var Map = map[string]string{
 	"language.name":                                              "English",
 	"language.region":                                            "United States",
 	"language.code":                                              "en_us",