travis: pybabel step addition
formatter: fixes for babel gettext formatting
installation: skip po directory
translations: fixes

* Fixed make task;
* Added invenio.pot to gitignore.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
fixes

* Moves washer to utils;
* Another fix in comments template for comments with no title;
* Uses CFG correctly in comments.views.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>