The source of the problem has been found. My service provider installed an older - 6.5 - version. This did not include the Hungarian language package. After the update - for 7.2, it works perfectly!

Thanks!

OSSN already have Hungarian in the core.

Hello!

Currently, Hungarian is unfortunately not among the languages that can be chosen. Out of Core?

Merged in core https://github.com/opensource-socialnetwork/opensource-socialnetwork/issues/2289

Thank you!

Yes because this is not a component. https://www.opensource-socialnetwork.org/wiki/view/1988/how-to-install-language-packs

When uploading the zip file, the system says: Component zip-archive incomplete
What might be the problem?