compton-conf-l10n software package provides Language package for compton-conf, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install compton-conf-l10n
compton-conf-l10n is installed in your system.
Make ensure the compton-conf-l10n package were installed using the commands given below,
$ sudo dpkg-query -l | grep compton-conf-l10n *
You will get with compton-conf-l10n package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | compton-conf-l10n |
| Version | 0.11.0-86-g6d2de75-1 |
| Description | Language package for compton-conf |
| Sub Section | Utils |