Language file available?

German translation is not available, but you can create your translation using tool like poedit.
Omega supports localization

Considering that Omega supports localization, they should offer some archive where users can upload their .mo and .po files to make them available to other users. Having everybody to do their own translations is just unnecessary.

Theme developer doesn’t have to do it. Theme Translations and Language Packs are Coming to www.ads-software.com. Please check this article below

https://wptavern.com/theme-translations-and-language-packs-are-coming-to-wordpress-org

That is very good news! Thanks for the link. 58% is already translated according to https://translate.www.ads-software.com/locale/de/default/wp-themes/omega

I cannot find a download link, though. Neither instructions how to obtain translations via WordPress.

Oh it’s there: Use link above, click “omega” link, choose “export” at the very bottom.