HYBRID 8/9 SYSTEM

PulseAudio 5 in Debian 8 stable is crap dipped in crap deep fried in crap. Debian 9 has PulseAudio 9 so they skipped THREE major versions... Anywho, if you're running 9-11R2 you might like to try a different way (other than backports) to get the latest version.

Create a file called /etc/apt/apt.conf.d/99defaultrelease with one line:
APT::Default-Release "stable";

Edit /etc/apt/sources.list and add one line:
deb http://ftp.debian.org/debian stretch main contrib non-free

Repopulate the package database:
sudo apt update

Locales appear to have been fixed in 9 so we can FINALLY:
sudo apt-mark unhold locales

before fetching Pulse 9 from testing:
sudo apt-get -t testing install pulseaudio

I don't know why that brings in LibreOffice 5 but it's a good upgrade so what the heck, go for it.      ?B^)