Use fa-bitbucket-square to distinguish Bitbucket Cloud and Bitbucket Server

app/views/import/bitbucket_server/status.html.haml

@@ -2,7 +2,7 @@
 - header_title 'Projects', root_path
 
 %h3.page-title
-  %i.fa.fa-bitbucket
+  %i.fa.fa-bitbucket-square
   Import projects from Bitbucket Server
   = link_to('Reconfigure', configure_import_bitbucket_server_path, class: 'btn btn-primary float-right', method: :post)
 

app/views/projects/_import_project_pane.html.haml

@@ -24,7 +24,7 @@
       - if bitbucket_server_import_enabled?
         %div
           = link_to status_import_bitbucket_server_path, class: "btn import_bitbucket" do
-            = icon('bitbucket', text: 'Bitbucket Server')
+            = icon('bitbucket-square', text: 'Bitbucket Server')
             = render 'bitbucket_import_modal'
         %div
       - if gitlab_import_enabled?