travis-ci: install babel with pip to stop easy_install
travis-ci: install babel with pip to stop easy_install

easy_install just fails, trying to install into ./.eggs
https://travis-ci.org/fdroidtravis/fdroidserver/jobs/319144754

f-droid/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver