Runs manual actions for the button helpers

Since the button helpers don't get picked up by the regex in the last
commit, I've had to fix these manually

app/helpers/snippets_helper.rb

@@ -16,7 +16,7 @@ module SnippetsHelper
             gitlab_raw_snippet_path(snippet, inline: false),
             target: '_blank',
             rel: 'noopener noreferrer',
-            class: "btn btn-sm has-tooltip",
+            class: "gl-button btn btn-default btn-sm has-tooltip",
             title: 'Download',
             data: { container: 'body' })
   end
@@ -54,7 +54,7 @@ module SnippetsHelper
 
     link_to(external_snippet_icon('doc-code'),
             gitlab_raw_snippet_blob_url(snippet, blob.path),
-            class: 'btn',
+            class: 'gl-button btn btn-default',
             target: '_blank',
             rel: 'noopener noreferrer',
             title: 'Open raw')
@@ -63,7 +63,7 @@ module SnippetsHelper
   def embedded_snippet_download_button(snippet, blob)
     link_to(external_snippet_icon('download'),
             gitlab_raw_snippet_blob_url(snippet, blob.path, nil, inline: false),
-            class: 'btn',
+            class: 'gl-button btn btn-default',
             target: '_blank',
             title: 'Download',
             rel: 'noopener noreferrer')

app/helpers/sorting_helper.rb

@@ -231,7 +231,7 @@ module SortingHelper
   end
 
   def sort_direction_button(reverse_url, reverse_sort, sort_value)
-    link_class = 'btn btn-default has-tooltip reverse-sort-btn qa-reverse-sort rspec-reverse-sort'
+    link_class = 'gl-button btn btn-default has-tooltip reverse-sort-btn qa-reverse-sort rspec-reverse-sort'
     icon = sort_direction_icon(sort_value)
     url = reverse_url
 

app/helpers/wiki_helper.rb

@@ -22,7 +22,7 @@ module WikiHelper
   end
 
   def wiki_sidebar_toggle_button
-    content_tag :button, class: 'btn btn-default sidebar-toggle js-sidebar-wiki-toggle', role: 'button', type: 'button' do
+    content_tag :button, class: 'gl-button btn btn-default sidebar-toggle js-sidebar-wiki-toggle', role: 'button', type: 'button' do
       sprite_icon('chevron-double-lg-left')
     end
   end
@@ -61,7 +61,7 @@ module WikiHelper
 
   def wiki_sort_controls(wiki, sort, direction)
     sort ||= Wiki::TITLE_ORDER
-    link_class = 'btn btn-default has-tooltip reverse-sort-btn qa-reverse-sort rspec-reverse-sort'
+    link_class = 'gl-button btn btn-default has-tooltip reverse-sort-btn qa-reverse-sort rspec-reverse-sort'
     reversed_direction = direction == 'desc' ? 'asc' : 'desc'
     icon_class = direction == 'desc' ? 'highest' : 'lowest'