[FIX] tools: sanitizer: decode pipe character

Mako uses pipe character in several occasions like |safe to tell an email is
safe. However the sanitizer will encode it, leading to template not correctly
rendered. Like other special characters used in mako, it is now decoded
after sanitize.

openerp/tools/mail.py

@@ -220,6 +220,7 @@ def html_sanitize(src, silent=True, sanitize_tags=True, sanitize_attributes=Fals
         cleaned = cleaned.replace('%20', ' ')
         cleaned = cleaned.replace('%5B', '[')
         cleaned = cleaned.replace('%5D', ']')
+        cleaned = cleaned.replace('%7C', '|')
         cleaned = cleaned.replace('&lt;%', '<%')
         cleaned = cleaned.replace('%&gt;', '%>')
     except etree.ParserError, e: