Create language file from Create>Localization>Create Language
Add words and assign them ids as you see in the screenshot below.
Make sure to add the created languages in the LanguageCollection.
Also assign default language.
Now in the Unity UI Text or TextmeshPro Text component add the script LocalizedTextScript.
In the ID try searching for the word defined in your language file you can search with ID or text content.
Select the word and that's it.
You can change language by calling the ChangeLanguage method in the LocalizationCollection scriptable object file.
You can also translate runtime with the id.
There is an example scene in the package check that out first.