rename "videoconf" as "videoconference" in url

tracim/tracim/controllers/workspace.py

     allow_only = not_anonymous()
 
     folders = UserWorkspaceFolderRestController()
-    videoconf = JitsiMeetController()
+    videoconference = JitsiMeetController()
 
     @property
     def _base_url(self):

tracim/tracim/templates/videoconf/toolbar.mak

         <div class="btn-group btn-group-vertical">
            ## INFO - G.M - 09-01-2018 - Share a link disabled, because
            ## link doesn't refresh.
-           ## <a title="${_('Invite by sharing a link')}" class="btn btn-default" data-toggle="modal" data-target="#videoconf-invite-modal-dialog" data-remote="${tg.url('/workspaces/{}/videoconf/invite'.format(result.workspace.id))}" >${ICON.FA('fa-share fa-fw t-less-visible')} ${_('Invite')}</a>
+           ## <a title="${_('Invite by sharing a link')}" class="btn btn-default" data-toggle="modal" data-target="#videoconf-invite-modal-dialog" data-remote="${tg.url('/workspaces/{}/videoconference/invite'.format(result.workspace.id))}" >${ICON.FA('fa-share fa-fw t-less-visible')} ${_('Invite')}</a>
         </div>
         <p></p>
     </div> <!-- # End of side bar right -->

tracim/tracim/templates/workspace/toolbar.mak

 
 <%def name="JITSI_MEET_BUTTON(current_user, workspace)">
     <div class="btn-group btn-group-vertical">
-        <a title="${_('Video conference')}" class="btn btn-default" href="${tg.url('/workspaces/{}/videoconf'.format(result.workspace.id))}">${ICON.FA('fa-video-camera fa-fw t-less-visible')} ${_('Video Conference')}</a>
+        <a title="${_('Video conference')}" class="btn btn-default" href="${tg.url('/workspaces/{}/videoconference'.format(result.workspace.id))}">${ICON.FA('fa-video-camera fa-fw t-less-visible')} ${_('Video Conference')}</a>
     </div>
 </%def>