Add better errors for disabled account recovery (#15117)

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>

routers/web/user/auth.go

@@ -1478,6 +1478,7 @@ func ForgotPasswd(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("auth.forgot_password_title")
 
 	if setting.MailService == nil {
+		log.Warn(ctx.Tr("auth.disable_forgot_password_mail_admin"))
 		ctx.Data["IsResetDisable"] = true
 		ctx.HTML(http.StatusOK, tplForgotPassword)
 		return