Scan to folder usually doesnt involve a PC at all. The scanner saves the file on a network share via NFS or smb

I like firewalld. Its also used on many enterprise distros (RHEL, SLES).

But if you just have to open one port for something, just use what’s installed on your distro.

Disable the “use system language” setting and choose your native language. You can then add English to your native languages layout as a secondary language.