Moves the number in the code, not as a translation parameter.

There is sometimes problems with cache and late loading of the translations, this commit avoids showing translation key in the contactlist title, by moving the parameter into the code.

lang/main.json

 {
-    "contactlist": "On Call (__participants__)",
+    "contactlist": "On Call",
     "connectionsettings": "Connection Settings",
     "poweredby": "powered by",
     "feedback": "Give us your feedback",

modules/UI/side_pannels/contactlist/ContactList.js

         .parent()[numberOfContacts > 1 ? 'show' : 'hide']();
 
     $("#contacts_container>div.title").text(
-        APP.translation.translateString(
-            "contactlist", {participants: numberOfContacts}
-        ));
+        APP.translation.translateString("contactlist")
+            + ' (' + numberOfContacts + ')');
 }
 
 /**