icons: replace icon-keyhole-circled with icon-lock for private repositories and gists

icon-lock is more iconic and easier to recognise.

kallithea/templates/base/base.html

@@ -101,7 +101,7 b''
 
         ## public/private
         %if c.db_repo.private:
-          <i class="icon-keyhole-circled"></i>
+          <i class="icon-lock"></i>
         %else:
           <i class="icon-globe"></i>
         %endif
@@ -315,7 +315,7 b''
             <li><a href="${h.url('gists')}"><i class="icon-globe"></i>${_('All Public Gists')}</a></li>
             %if request.authuser.username != 'default':
               <li><a href="${h.url('gists', public=1)}"><i class="icon-user"></i>${_('My Public Gists')}</a></li>
-              <li><a href="${h.url('gists', private=1)}"><i class="icon-keyhole-circled"></i>${_('My Private Gists')}</a></li>
+              <li><a href="${h.url('gists', private=1)}"><i class="icon-lock"></i>${_('My Private Gists')}</a></li>
             %endif
           </ul>
       </li>
@@ -439,7 +439,7 b''
                         tmpl += '<span class="label label-repo" title="${_('Git repository')}">git</span> ';
                     }
                     if(obj_dict['private']){
-                        tmpl += '<i class="icon-keyhole-circled"></i>';
+                        tmpl += '<i class="icon-lock"></i>';
                     }
                     else if(visual_show_public_icon){
                         tmpl += '<i class="icon-globe"></i>';

kallithea/templates/data_table/_dt_elements.html

@@ -18,7 +18,7 b''
         ${get_name(name)}
     </a>
     %if private and c.visual.show_private_icon:
-      <i class="icon-keyhole-circled" title="${_('Private repository')}"></i>
+      <i class="icon-lock" title="${_('Private repository')}"></i>
     %elif not private and c.visual.show_public_icon:
       <i class="icon-globe" title="${_('Public repository')}"></i>
     %endif