Stretch: dependency python-pybabel is not available

[alexAubin]

On Stretch, searx is currently not installable because python-pybabel is not available :

Package python-pybabel is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source

A quick and dirty test was to remove this dependency, and then I was able to have a successful install, though I didn't check if the app was still functional.

[trillerpfeife]

python-babel is present instead. python-pybabel is just a transitional package for python-babel. I tested the app by changing the dependency and it worked out!