Improve error message for prohibited filenames

lib/gitlab/git_access.rb

@@ -251,7 +251,7 @@ module Gitlab
       if git_hook.file_name_regex.present?
         commit.diffs.each do |diff|
           if (diff.renamed_file || diff.new_file) && diff.new_path =~ Regexp.new(git_hook.file_name_regex)
-            return build_status_object(false, "File name #{diff.new_path.inspect} does not follow the pattern '#{git_hook.file_name_regex}'")
+            return build_status_object(false, "File name #{diff.new_path.inspect} is prohibited by the pattern '#{git_hook.file_name_regex}'")
           end
         end
       end