remove 'Github' from oauth login error messages

pkg/api/login_oauth.go

@@ -46,9 +46,9 @@ func OAuthLogin(ctx *middleware.Context) {
 	userInfo, err := connect.UserInfo(token)
 	if err != nil {
 		if err == social.ErrMissingTeamMembership {
-			ctx.Redirect(setting.AppSubUrl + "/login?failedMsg=" + url.QueryEscape("Required Github team membership not fulfilled"))
+			ctx.Redirect(setting.AppSubUrl + "/login?failedMsg=" + url.QueryEscape("Required team membership not fulfilled"))
 		} else if err == social.ErrMissingOrganizationMembership {
-			ctx.Redirect(setting.AppSubUrl + "/login?failedMsg=" + url.QueryEscape("Required Github organization membership not fulfilled"))
+			ctx.Redirect(setting.AppSubUrl + "/login?failedMsg=" + url.QueryEscape("Required organization membership not fulfilled"))
 		} else {
 			ctx.Handle(500, fmt.Sprintf("login.OAuthLogin(get info from %s)", name), err)
 		}