[damned-lies] Add one more unicode_literals

[Claude Paroz <claudep src gnome org>]

commit 87a635a4e3b027858b48e50c06f00b8a762fbde1
Author: Claude Paroz <claude 2xlibre net>
Date:   Wed Nov 16 19:46:43 2016 +0100

    Add one more unicode_literals

 vertimus/forms.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/vertimus/forms.py b/vertimus/forms.py
index ec8b04c..302a9f2 100644
--- a/vertimus/forms.py
+++ b/vertimus/forms.py
@@ -17,6 +17,7 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, see <http://www.gnu.org/licenses/>.
+from __future__ import unicode_literals
 
 import os
 
@@ -56,7 +57,7 @@ class AuthorWidget(forms.Select):
                 label = ugettext("%(name)s (email missing)") % {'name': label}
             elif val in selected_choices:
                 selected_html = ' selected'
-            output.append(format_html(u'<option value="{0}"{1}>{2}</option>',
+            output.append(format_html('<option value="{0}"{1}>{2}</option>',
                 val, selected_html, label))
         return '\n'.join(output)