global: unicode literals for views
global: unicode literals for views

* Forces unicode literals on views. (addresses #2967)

* PEP8/257 code style improvements.

Signed-off-by: Leonardo Rossi <5460ec99b71a72e7693c4088b5c2585e76e1c857@cern.ch>

inveniosoftware/invenio-communities,inveniosoftware/invenio-communities,inveniosoftware/invenio-communities,inveniosoftware/invenio-communities