Assorted Bitbucket Server importer code cleanup based on review

app/controllers/import/bitbucket_server_controller.rb

@@ -13,7 +13,7 @@ class Import::BitbucketServerController < Import::BaseController
   # Repository names are limited to 128 characters. They must start with a
   # letter or number and may contain spaces, hyphens, underscores, and periods.
   # (https://community.atlassian.com/t5/Answers-Developer-Questions/stash-repository-names/qaq-p/499054)
-  VALID_BITBUCKET_CHARS = /\A[a-zA-z0-9\-_\.\s]+\z/
+  VALID_BITBUCKET_CHARS = /\A[\w\-_\.\s]+\z/
 
   def new
   end

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

@@ -41,12 +41,9 @@
             = link_to project.full_path, [project.namespace.becomes(Namespace), project]
           %td.job-status
             - if project.import_status == 'finished'
-              %span
-                %i.fa.fa-check
-                Done
+              = icon('check', text: 'Done')
             - elsif project.import_status == 'started'
-              %i.fa.fa-spinner.fa-spin
-              started
+              = icon('spin', text: 'started')
             - else
               = project.human_import_status_name
 

lib/bitbucket_server/page.rb

@@ -20,7 +20,7 @@ module BitbucketServer
     private
 
     def parse_attrs(raw)
-      raw.slice(*%w(size nextPageStart isLastPage)).symbolize_keys
+      raw.slice('size', 'nextPageStart', 'isLastPage').symbolize_keys
     end
 
     def parse_values(raw, bitbucket_rep_class)