Events: kickstart shared scoreboard

app/views/events/_form.html.slim

@@ -15,6 +15,13 @@
     .alert.alert-primary role="alert"
         = t("events.form.shared_scoreboard_message")
 
+    if method == :patch
+        .row.mb-3
+            .col
+                .form-floating
+                    = form.select :lang, Languages::AVAILABLE_LANGUAGES.map { |lang| [ lang[:name], lang[:id] ] }, {}, class: "form-select"
+                    = form.label :lang
+
     .row.mt-4
         .col
             - if method == :patch

app/views/events/show.html.slim

@@ -8,7 +8,14 @@
         a.mt-3.btn.btn-primary.mb-4 href=new_contest_path(event: @event.id)
           = t("events.show.new_contest")
 
-.row.row-cols-1.row-cols-md-3.g-4
+- if @event.shared_scoreboard
+  a.btn.btn-success href="/public/event/#{@event.slug}" style="margin-top: -6px;"
+    = t("events.show.open_shared_scoreboard")
+- else
+  a.btn.btn-success.disabled style="margin-top: -6px;"
+    = t("events.show.shared_scoreboard_disabled")
+
+.mt-3.row.row-cols-1.row-cols-md-3.g-4
   - @contests.each do |contest|
     .col
       css: