[demo] Update app.py

app.py

@@ -37,7 +37,7 @@ OUTPUT_FAIL = (STYLE + """
         <div class="row"><h1 style="text-align: center">The speakers are</h1></div>
         <div class="row"><h1 class="display-1 text-danger" style="text-align: center">{:.1f}%</h1></div>
         <div class="row"><h1 style="text-align: center">similar</h1></div>
-        <div class="row"><h1 class="text-danger" style="text-align: center">You shall not pass!</h1></div>
+        <div class="row"><h1 class="text-danger" style="text-align: center">Warning! stranger!</h1></div>
         <div class="row"><small style="text-align: center">(You must get at least 50% to be considered the same person)</small><div class="row">
     </div>
 """)