Maintenance release with added Swedish translation of the Dashboard UI and other minor tweaks.

Hangfire.Core

• Added – First version of Swedish translation of the Dashboard UI (by @karl-sjogren).
• Changed – More detailed message for exception when JobStorage.Current is not initialized.
• Changed – Make TypeHelperSerializationBinder class public to use it from custom serializer settings.
• Fixed – Small typos in French resources for the Dashboard UI (by @agriffard).
• Fixed – Document the exception for the IJobCancellationToken interface method (by @judah4).

Hangfire.NetCore and Hangfire.AspNetCore

• Changed – Wait for application to be ready before starting the server when using AddHangfireServer.
• Fixed – Do not return null as result of StopAsync in hosted service implementation (by @tomaszek92).