+ |> extract_preferred_language()
+ |> normalize_language_codes()
+ |> all_supported()
+ |> Enum.uniq()
+ end
+
+ defp all_supported(locales) do
+ locales
+ |> Pleroma.Web.Gettext.ensure_fallbacks()
+ |> Enum.filter(&supported_locale?/1)
+ end
+
+ defp normalize_language_codes(codes) do
+ codes
+ |> Enum.map(fn code -> Pleroma.Web.Gettext.normalize_locale(code) end)
+ end
+
+ defp extract_preferred_language(conn) do
+ extract_frontend_language(conn) ++ extract_accept_language(conn)
+ end
+
+ defp extract_frontend_language(conn) do
+ %{req_cookies: cookies} =
+ conn
+ |> Plug.Conn.fetch_cookies()
+
+ case cookies[frontend_language_cookie_name()] do
+ nil ->
+ []
+
+ fe_lang ->
+ String.split(fe_lang, ",")
+ end