`wp language plugin install <plugin> <language>`: `Language '<language>' not available.`

Bug Report

[x] Yes, I reviewed the contribution guidelines.
[x] Yes, more specifically, I reviewed the guidelines on how to write clear bug reports.

Describe the current, buggy behavior When trying to install a specific language for a specific plugin, where the language exist, the wp language plugin install command prints Language '<language>' not available..

Describe how other contributors can replicate this bug

Install a plugin for which the specific language to be installed exists (here: de_DE (de_DE_formal would also work) (here: Advanced Order Export For WooCommerce (woo-order-export-lite)).
Invoke wp language plugin install woo-order-export-lite de_DE to install the de_DE language for the woo-order-export-lite plugin. Note that wp CLI prints a warning that the specified language de_DE is not available and that no translation files are downloaded and become available:
```
Warning: Language 'de_DE' not available.
Language 'de_DE' not installed.
Success: Installed 0 of 1 languages (1 skipped).
```

Describe what you would expect as the correct outcome The specific language that is available should be successfully installed and become available.

Let us know what environment you are running this on

OS:     Linux 5.4.0-117-generic #132-Ubuntu SMP Thu Jun 2 00:39:06 UTC 2022 x86_64
Shell:  /bin/bash
PHP binary:     /usr/bin/php7.4
PHP version:    7.4.30
php.ini used:   /etc/php/7.4/cli/php.ini
MySQL binary:   /usr/bin/mysql
MySQL version:  mysql  Ver 15.1 Distrib 10.5.16-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
SQL modes:
WP-CLI root dir:        phar://wp-cli.phar/vendor/wp-cli/wp-cli
WP-CLI vendor dir:      phar://wp-cli.phar/vendor
WP_CLI phar path:       /home/web
WP-CLI packages dir:
WP-CLI global config:
WP-CLI project config:
WP-CLI version: 2.6.0

Provide a possible solution (Not sure what is responsible: The language API; the request to the language API?).

Provide additional context/Screenshots Translations are available for language de_DE for that specific plugin: https://translate.wordpress.org/locale/de/default/wp-plugins/woo-order-export-lite/

There is a notice though on the German (de_DE) version of the plugin page that indicates that the plugin hadn't been translated in German yet - but the translate list contradicts this, as a quite high percentage is already translated.

wp-cli / language-command

`wp language plugin install <plugin> <language>`: `Language '<language>' not available.` #119

Bug Report