Unfortunately, the portal is not available in Ukrainian.
To use the portal, you need to register online with the Federal Employment Agency (Bundesagentur für Arbeit, Jobcenter). After registration, you will receive access to all the online features of the Jobcenter and will be able to submit all future applications, forms, supporting documents, etc. online. This will save you a lot of time and effort.
A good guide in Ukrainian that will help you with your registration can be found on this website.