REmove icons from milestone filters

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/dashboard/issues.html.haml

@@ -8,8 +8,8 @@
 .append-bottom-20
   .pull-right
     - if current_user
-      .hidden-xs.pull-left
-        = link_to issues_dashboard_url(format: :atom, private_token: current_user.private_token), class: 'btn' do
+      .hidden-xs.pull-left.prepend-top-20
+        = link_to issues_dashboard_url(format: :atom, private_token: current_user.private_token), class: '' do
           %i.fa.fa-rss
 
   = render 'shared/issuable/filter', type: :issues

app/views/shared/_milestones_filter.html.haml

@@ -2,13 +2,10 @@
   %ul.center-top-menu
     %li{class: ("active" if params[:state].blank? || params[:state] == 'opened')}
       = link_to milestones_filter_path(state: 'opened') do
-        %i.fa.fa-exclamation-circle
         Open
     %li{class: ("active" if params[:state] == 'closed')}
       = link_to milestones_filter_path(state: 'closed') do
-        %i.fa.fa-check-circle
         Closed
     %li{class: ("active" if params[:state] == 'all')}
       = link_to milestones_filter_path(state: 'all') do
-        %i.fa.fa-compass
         All