增加邮件时，邮件内容格式统一

services/mailer/mail.go

@@ -97,7 +97,7 @@ func SendResetPasswordMail(locale Locale, u *models.User) {
 func SendActivateEmailMail(locale Locale, u *models.User, email *models.EmailAddress) {
 	data := map[string]interface{}{
 		"DisplayName":     u.DisplayName(),
-		"ActiveCodeLives": timeutil.MinutesToFriendly(setting.Service.ActiveCodeLives, locale.Language()),
+		"ActiveCodeLives": timeutil.MinutesToFriendly(setting.Service.ActiveCodeLives, "en-US"),
 		"Code":            u.GenerateEmailActivateCode(email.Email),
 		"Email":           email.Email,
 	}