Merge pull request '统一登录前后的中英文' (#141) from fix-140 into V20210731

Reviewed-on: https://git.openi.org.cn/OpenI/aiforge/pulls/141

routers/user/auth.go

@@ -535,7 +535,10 @@ func handleSignInFull(ctx *context.Context, u *models.User, remember bool, obeyR
 		log.Error("Unable to store session: %v", err)
 	}
 
-	// Language setting of the user overwrites the one previously set
+	// Language setting of the user use the one previously set
+	if len(ctx.GetCookie("lang")) != 0 {
+		u.Language = ctx.GetCookie("lang")
+	}
 	// If the user does not have a locale set, we save the current one.
 	if len(u.Language) == 0 {
 		u.Language = ctx.Locale.Language()