Proper html sanitation for static pages

app/views/pages/contact.haml

 :markdown
-  #{t '.content'}
+  #{sanitize t '.content'}

app/views/pages/filter.haml

 %h2
   %em.fa.fa-filter
-  = title t('.title')
+  = title t '.title'
 
 :markdown
   #{t '.helper'}

app/views/pages/infos.haml

 :markdown
-  #{t '.content'}
+  #{sanitize t '.content'}
 
 %a(href="http://validator.w3.org/unicorn/check?ucn_uri=#{root_url}"
    style="text-decoration:none;")

app/views/pages/rules.haml

 :markdown
-  #{t '.content'}
+  #{sanitize t '.content'}