There are two main ways how you can import a new language into your new theme.
Go to your back office > Localization > Translations and find a tab named Add/Update a language. Here you can select the language you need to import and also the theme where the language should be imported. By this way you can also update translations.
All these translations come from the official Prestashop database. Some languages are translated 100%, some of them are still in progress. You can check the current state of translations of your language here: https://crowdin.com/project/prestashop-official.
If the quality of the translation of your language is too bad, you can try to search for it on google, there are many websites which offer these language packs, but usually they are not for free. The other option would be translating everything manually.
In case you already use a theme with a language translation that meets your requirements, you can simply "copy" this translation into the new installed theme.
Go to back office > Localization > Translation and find a tab named "Copy".
Obviously, you can do this only if you have a language pack, most commonly when you purchase (or download for free) this pack from some website.
Let me know what was your experience with the installation of your language!
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Andrej is a Prestashop enthusiast. He started by developing his own themes and then formed the idea of creating Theme Maker. He enjoys finding ways to make his life simpler, and that is the philosophy he incorporates into all his projects. Andrej is also interested in WordPress, Amazon FBA, drop shipping, studying languages, and reading books.