[#1110] Use tags method rather than ALLOWED_TAGS class constant

app/models/concerns/mail_template_concern.rb

@@ -34,6 +34,10 @@ module MailTemplateConcern
     replace_tags(body, dossier)
   end
 
+  def tags
+    self.class.const_get(:ALLOWED_TAGS)
+  end
+
   def replace_tags(string, dossier)
     TAGS.inject(string) do |acc, tag|
       acc.gsub("--#{tag[:libelle]}--", replace_tag(tag, dossier)) || acc

app/views/admin/mail_templates/edit.html.haml

@@ -22,7 +22,7 @@
             Balise
           %th
             Description
-        - @mail_template.class.const_get(:ALLOWED_TAGS).each do |tag|
+        - @mail_template.tags.each do |tag|
           %tr
             %td.center
               = "--#{tag[:libelle]}--"