Merge branch 'dz-remove-icons' into 'master'

Remove icons from file edit tabs

We don't need this icons and it also inconsistent with current UI 

See merge request !5072

app/views/projects/blob/edit.html.haml

@@ -4,12 +4,10 @@
   %ul.nav-links.no-bottom.js-edit-mode
     %li.active
       = link_to '#editor' do
-        = icon('edit')
         Edit File
 
     %li
       = link_to '#preview', 'data-preview-url' => namespace_project_preview_blob_path(@project.namespace, @project, @id) do
-        = icon('eye')
         = editing_preview_title(@blob.name)
 
   = form_tag(namespace_project_update_blob_path(@project.namespace, @project, @id), method: :put, class: 'form-horizontal js-quick-submit js-requires-input js-edit-blob-form') do