deposit: rename /deposit to /submit

* Renames all appearances of deposit for submit.

* Adds BLUEPRINTS_URL_PREFIXES to modify deposit url prefix.

* NOTE In order to modify the breadcrum of deposit module and useful
  for the future, introduces Babel configuration to allow translation
  of strings in the overlay. In development mode, to see the translated
  strings, run $ python setup.py compile_catalog
  Translation catalog is compiled automatically if you install
  using $ python setup.py install

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
I don't know if we should really care about this page if it's temporary. 

If we want to use it longer it is, however, much better to make these changes in invenio first. Then we have a css file in invenio and we can use it in inspire as well.