[FIX] translate: do not translate <!DOCTYPE>

Avoid the DOCTYPE tranlation. If this tag is changed, the html rendering is altered. The other effet is that the web_editor wrap the content with <span> to translate, but some explorer eject tags (doctype, head content, script, style, meta) et insert this tags in the body.
NB: DOCTYPE is not a node but a text.

openerp/tools/translate.py

@@ -151,6 +151,8 @@ TRANSLATED_ATTRS = {
     'string', 'help', 'sum', 'avg', 'confirm', 'placeholder', 'alt', 'title',
 }
 
+avoid_pattern = re.compile(r"[\s\n]*<!DOCTYPE", re.IGNORECASE)
+
 class XMLTranslator(object):
     """ A sequence of serialized XML/HTML items, with some of them to translate
         (todo) and others already translated (done). The purpose of this object
@@ -241,7 +243,8 @@ class XMLTranslator(object):
 
         # process children nodes locally in child_trans
         child_trans = XMLTranslator(self.callback, self.method, parser=self.parser)
-        child_trans.todo(escape(node.text or ""))
+        if node.text and not avoid_pattern.match(node.text):
+            child_trans.todo(escape(node.text))
         for child in node:
             child_trans.process(child)