[IMP] tools.translate: be more lenient and accept standart gettext source annotations

[IMP] tools.translate: be more lenient and accept standart gettext source annotations

 The GetText spec says that PO auto-comments indicating
  the source location have this form:
   #: /path/to/file:lineno
  However OpenERP's POT export system defaults to a modified
  version of this format with an extra 'type' field:
   #: type:/path/to/file:lineno
  The babel extractors we use for openerp-web's translations
  have the GetText format hardcoded, so it's a good idea
  to be more lenient and allow the standards annotations too.
  We can use a default 'code' type for such cases.

  For openerp-web translations the type does not matter,
  as the translations will be directly loaded by the
  web engine from the PO files and served in Javascript
 to the browser, with no typing needed.

  This patch simply avoids failing to parse updated PO files
  that will contain standard GetText annotations for the
  openerp-web related terms.

bzr revid: odo@openerp.com-20120202143210-05p1w24t6u77cyv8