Import _ from cubicweb

Silence cubicweb 3.22 deprecation warnings by not relying on _ being
builtin.

utils.py

@@ -21,6 +21,10 @@ from datetime import datetime, date
 from logilab.common.date import previous_month, first_day, date_range, last_day
 from logilab.common.shellutils import ProgressBar
 
+try:
+    from cubicweb import _
+except ImportError:
+    _ = unicode
 from cubicweb.req import FindEntityError
 from cubicweb.web import NotFound, Redirect
 

views/actions.py

@@ -14,6 +14,10 @@
 # You should have received a copy of the GNU Lesser General Public License along
 # with this program. If not, see <http://www.gnu.org/licenses/>.
 
+try:
+    from cubicweb import _
+except ImportError:
+    _ = unicode
 from cubicweb.web import action
 from cubicweb.predicates import match_user_groups
 

views/startup.py

@@ -26,6 +26,10 @@ import urllib
 from logilab.mtconverter import xml_escape
 from logilab.common.textutils import BYTE_UNITS
 
+try:
+    from cubicweb import _
+except ImportError:
+    _ = unicode
 from cubicweb.view import StartupView
 from cubicweb.web.views import forms
 from cubicweb.web.formfields import StringField, DateField