You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: locale.go
    path of file: ./repos/gitea/modules/web/middleware
    
    the code of the file until where you have to start completion: // Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package middleware

import (
	"net/http"

	"code.gitea.io/gitea/modules/translation"
	"code.gitea.io/gitea/modules/translation/i18n"

	"golang.org/x/text/language"
)

// Locale handle locale
func Locale(resp http.Respons
    
func Locale(resp http.ResponseWriter, req *http.Request) translation.Locale {
	// 1. Check URL arguments.
	lang := req.URL.Query().Get("lang")
	changeLang := lang != ""

	// 2. Get language information from cookies.
	if len(lang) == 0 {
		ck, _ := req.Cookie("lang")
		if ck != nil {
			lang = ck.Value
		}
	}

	// Check again in case someone changes the supported language list.
	if lang != "" && !i18n.DefaultLocales.HasLang(lang) {
		lang = ""
		changeLang = false
	}

	// 3. Get language information from 'Accept-Language'.
	// The first element in the list is chosen to be the default language automatically.
	if len(lang) == 0 {
		tags, _, _ := language.ParseAcceptLanguage(req.Header.Get("Accept-Language"))
		tag := translation.Match(tags...)
		lang = tag.String()
	}

	if changeLang {
		SetLocaleCookie(resp, lang, 1<<31-1)
	}

	return translation.NewLocale(lang)
}