Remove unused import

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/formats.py

@@ -21,7 +21,7 @@
 File format specific behavior.
 '''
 from django.utils.translation import ugettext_lazy as _
-from translate.convert import po2php, convert
+from translate.convert import po2php
 from translate.storage.lisa import LISAfile
 from translate.storage.properties import propunit, propfile
 from translate.storage.xliff import xliffunit, xlifffile