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>
Thanks for the suggestion, we can rethink that page to include as well the possibility to delete directly the ongoing depositions and even 'Clear all' in case you have a lot of unfinished ones. I close the PR and create a task in Asana to have a look at this page