apply Simple Line Icons

lib/views/layout-growi/widget/comments.html

@@ -8,11 +8,11 @@
       {# transplanted to PageComments React component -- 2017.06.02 Yuki Takei
       <div class="page-comments-list-newer collapse" id="page-comments-list-newer"></div>
 
-      <a class="page-comments-list-toggle-newer text-center" data-toggle="collapse" href="#page-comments-list-newer"><i class="fa fa-angle-double-up"></i> Comments for Newer Revision <i class="fa fa-angle-double-up"></i></a>
+      <a class="page-comments-list-toggle-newer text-center" data-toggle="collapse" href="#page-comments-list-newer"><i class="ti-angle-double-up"></i> Comments for Newer Revision <i class="ti-angle-double-up"></i></a>
 
       <div class="page-comments-list-current" id="page-comments-list-current"></div>
 
-      <a class="page-comments-list-toggle-older text-center" data-toggle="collapse" href="#page-comments-list-older"><i class="fa fa-angle-double-down"></i> Comments for Older Revision <i class="fa fa-angle-double-down"></i></a>
+      <a class="page-comments-list-toggle-older text-center" data-toggle="collapse" href="#page-comments-list-older"><i class="ti-angle-double-down"></i> Comments for Older Revision <i class="ti-angle-double-down"></i></a>
 
       <div class="page-comments-list-older collapse in" id="page-comments-list-older"></div>
       #}