Unfortunately, there is no specific setting yet to filter language in major clients. At most clients will directly translate into 'best guess' target language like Amethyst and Damus (Purple member) done.

Currently nfrelay.app provides NIP-32 event for language labelling. Hopefully more labeller comes and client can pick up and choose data freely.

nostr:nevent1qqs9scpv9m2g4m2texmjk5a22mf4w6mj93wrgegua0d26mdxu6yevegpzamhxue69uhhgetnwshxuenjv4kxz7fwv9c8qtcpzemhxue69uhkummnw3ez6un9d3shjtnpwpcz7q3q9dn7fq9hlxwjsdtgf28hyakcdmd73cccaf2u7a7vl42echey7ezst9k7dw