Don't create fuzzy translation

utils/update-translations.sh

 
 pybabel extract -F babel.cfg -o messages.pot $SEARX_DIR
 for f in `ls $SEARX_DIR'/translations/'`; do
-    pybabel update -i messages.pot -d $SEARX_DIR'/translations/' -l $f
+    pybabel update -N -i messages.pot -d $SEARX_DIR'/translations/' -l $f
     # TODO - need to fix category translations
     sed -i 's/#~ //' $SEARX_DIR'/translations/'$f'/LC_MESSAGES/messages.po'
 done