The v1.03 update includes a fix for shadow maps with new Nvidia driver, tweaks to bomber attack values and the Romanian airforce.
However, the main change in this update is the new German language support: you will now be able to play in German if it is your native language.
For the full change log you can visit the related Forum Page.
To download the update, players can run “Check for Update” via the game menu or on the game’s download page.
Get more information on Germany at War: Barbarossa 1941 from its official product page.