Fixes enter room name field in the welcome page.

index.html

@@ -35,7 +35,7 @@
                     <div id="enter_room_form" >
                         <div id="domain_name"></div>
                         <div id="enter_room">
-                            <input id="enter_room_field" type="text" autofocus data-i18n="[placeholder]welcomepage.roomname" placeholder="Enter room name" />
+                            <input id="enter_room_field" type="text" autofocus/>
                             <div class="icon-reload" id="reload_roomname"></div>
                             <input id="enter_room_button" type="button" data-i18n="[value]welcomepage.go" value="GO" />