apertium-spa software package provides Apertium single language data for Spanish, 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 apertium-spa
apertium-spa is installed in your system.
Make ensure the apertium-spa package were installed using the commands given below,
$ sudo dpkg-query -l | grep apertium-spa *
You will get with apertium-spa package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Science |
| Package | apertium-spa |
| Version | 0.1.0~r65494-1 |
| Description | Apertium single language data for Spanish |
| Sub Section | Science |