[docs] pybabel extract requires a directory
[docs] pybabel extract requires a directory

Signed-off-by: Armin Ronacher <51e1b983df8328b92ad653ca9129d9a11178303a@active-4.com>

wong2/flask-babel,Khan/flask-babel,eliangcs/flask-babel,uniphil/flask-babel,mdxs/flask-babel,uniphil/flask-babel,Hardtack/flask-babel,eliangcs/flask-babel,Hardtack/flask-babel,madssj/flask-babel,lalinsky/flask-babel,TkTech/flask-babel,DasIch/flask-babel,jmagnusson/flask-babel,spoqa/flask-babel,madssj/flask-babel,mitsuhiko/flask-babel,DasIch/flask-babel,palfrey/flask-babel,spoqa/flask-babel,mitsuhiko/flask-babel,lalinsky/flask-babel,bendavis78/flask-babel,mdxs/flask-babel