Merge branch 'instance-v2' into 'develop'

Show instance language in /api/v2/instance

See merge request soapbox-pub/rebased!260

lib/pleroma/web/mastodon_api/views/instance_view.ex

@@ -72,7 +72,7 @@ def render("show2.json", _) do
           URI.merge(Pleroma.Web.Endpoint.url(), Keyword.get(instance, :instance_thumbnail))
           |> to_string
       },
-      languages: ["en"],
+      languages: Keyword.get(instance, :languages, ["en"]),
       configuration: configuration2(),
       registrations: %{
         enabled: Keyword.get(instance, :registrations_open),