fixed name format

src/plainui/jinja2/plainui/index.html.j2

@@ -28,7 +28,7 @@
               {{ integrations.vocPlayer(playerId="player-" ~ stream.slug) }}
               <small class="hub-index-stream__name">
                 {% if event %}
-                  {{ _("Now: %(name)", name=event.name) }}
+                  {{ _("Now: %(name)s", name=event.name) }}
                 {% else %}
                   {% with next_event = stream.get_next_event() %}
                     {% if next_event %}