Customizing and Translating Text
WHMCS supports over 25 different languages with the ability to add more to your installation with customizations.
You can also provide translations for your products. For more information, see Translating Product Names and Descriptions.
Translations in WHMCS
Translated words and phrases for each supported language exist in files within the
lang directories for both the Client Area and Admin Area.
You can create your own languages in WHMCS by creating additional files in the lang directories.
For more information, see Adding a Language.