make the default error message more ambigious

public/client.html

@@ -132,7 +132,7 @@ <h1 id="client_loadingtext">Loading</h1>
         <div id="client_chartable"></div>
       </div>
       <div id="client_error" class="error" style="display: none">
-        <h1 id="client_errortext">You were disconnected from the server.</h1>
+        <h1 id="client_errortext">Connection error.</h1>
         <p style="color: #a00">
           Code:
           <span id="error_id">(none)</span>