Update message for invalid events.

synapse/res/templates/notif.html

@@ -34,7 +34,7 @@
                     {%- elif message.msgtype == "m.file" %}
                         <span class="filename">{{ message.body_text_plain }}</span>
                     {%- else %}
-                        An unknown event.
+                        A message with unrecognised content.
                     {%- endif %}
                 {%- endif %}
             </div>

synapse/res/templates/notif.txt

@@ -14,7 +14,7 @@ An encrypted message.
 {%- elif message.msgtype == "m.file" %}
 {{ message.body_text_plain }}
 {%- else %}
-An unknown event.
+A message with unrecognised content.
 {%- endif %}
 {%- endif %}
 {%- endfor %}