Umh I installed XAMPP and Composer on Windows because was afraid of install Composer on my VPS where I use a control panel and have website, services, email. I do not know what happen if I install composer on VPS.
On Windows if I try to install the Italian Language Pack I get errors:
D:\XAMPP\htdocs>composer require nearata/flarum-ext-italian
[InvalidArgumentException]
Could not find a version of package nearata/flarum-ext-italian matching your minimum-stability (stable). Require it
with an explicit version constraint allowing its desired stability.
require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>]...