To add a new language to a Magento store and enable or disable languages, you can follow these steps:
Add new language:
Log in to the Magento admin panel and go to “Stores” > “Configuration” > “General” > “Locale Options”.
Under “Locale”, select the language you want to add from the dropdown menu.
Save the configuration.
Go to “Stores” > “Configuration” > “General” > “General” and set the new language as the default language.
Enable or disable languages:
Log in to the Magento admin panel and go to “Stores” > “Configuration” > “General” > “Locale Options”.
Under “Locale”, select the language you want to enable or disable.
Change the status of the language to “Enabled” or “Disabled”
Save the configuration.
Note: You need to have the language pack installed in your Magento installation, if you don’t have the language pack you can download it from the official Magento website. Also, keep in mind that enabling or disabling languages will affect the store views, and you may have to adjust some settings accordingly.