How to localize javascript file?

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C#

ASP.NET

Javascript

jQuery

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Hi,
I have Asp.net mvc 4 solution. So, i have used to nuget localization package to localize my application. it is working fine on .cshtml file as below example.

@Html.Localize("systemName")

above "systemName" is the key. It may have different values according to language.

And alos, i have a javascript file calles custom.js . But i couldn't localize this js file.

Example:-

if (paymentDate === "") {
              $(obj).find("#datepicker").addClass("has-error").attr("title", "Skriv inn en gyldig dato");//Please enter a valid Date
              $(obj).find("#datepicker").tooltip("show");
              isValid = false;
          } else {
              $(obj).find("#datepicker").removeClass("has-error").attr("title", "Skriv inn en gyldig dato");
              $(obj).find("#datepicker").tooltip("destroy");
          }

so, i tried much times to do this,.but i couldn't. Please help me to solve this.
Thanks All.

What I have tried:

I have tried but not fixed yet.