The question is How to add country flag in head for language selection? It is very actual for multilingual installs. For me now it's just e.g. Русский (visible), but second option, e.g. English is hidden (not visible). And if your foreign users didnt know first (active) language they cant change language cause they didnt understand where is language selector located. We need small country flag in front of language title.
I am already discuss it with language pack mantainers and Country Flag extension authors.
And how notice KaiKimera, all language packs have an icon - country flag. So, all needed resource already uploaded.
And how notice Litalino it can be done in Flarum's default plugin.