Added a note on the possibility to use nicknames or email addresses to login.  Changed "Login via" into "Login method".
Added a note on the possibility to use nicknames or email addresses to
login.  Changed "Login via" into "Login method".

tiborsimko/invenio-accounts,inspirehep/invenio-accounts,tiborsimko/invenio-accounts,inveniosoftware/invenio-accounts,inveniosoftware/invenio-accounts,inveniosoftware/invenio-accounts,inspirehep/invenio-accounts,tiborsimko/invenio-accounts,inspirehep/invenio-accounts