fix: invite preRegisterUsername limit

lang/chs/lang_takeinvite.php

@@ -3,6 +3,7 @@
 $lang_takeinvite = array
 (
 	'head_invitation_failed' => "邀请失败！",
+	'std_username_too_long' => "对不起，用户名过长（至多12个字符）",
 	'std_must_enter_email' => "你必须输入邮箱地址！",
 	'std_invalid_email_address' => "无效的邮箱地址！",
 	'std_must_enter_personal_message' => "请添加信件中的私人内容。",

lang/cht/lang_takeinvite.php

@@ -3,6 +3,7 @@
 $lang_takeinvite = array
 (
 	'head_invitation_failed' => "邀請失敗！",
+	'std_username_too_long' => "對不起，用戶名過長（至多12個字元）",
 	'std_must_enter_email' => "你必須輸入郵箱位址！",
 	'std_invalid_email_address' => "無效的郵箱地址！",
 	'std_must_enter_personal_message' => "請添加信件中的私人內容。",

lang/en/lang_takeinvite.php

@@ -3,6 +3,7 @@
 $lang_takeinvite = array
 (
 	'head_invitation_failed' => "Invitation failed!",
+	'std_username_too_long' => "Sorry, the username is too long (up to 12 characters)",
 	'std_must_enter_email' => "You must enter an email address!",
 	'std_invalid_email_address' => "Invalid email address!",
 	'std_must_enter_personal_message' => "Please add a personal message.",