Form Workflow Plus is currently available in the following languages for users in a workflow:
The default language is English.
The workflow Creator can select the language the Request for approval email is sent. Deactivate the workflow by toggling the activation button to Off then click the "Setup and Activate Workflow" button.
Go to the Advanced Settings > scroll down to Email Template Language and select desired language, as shown:
Form Workflow Plus Dashboard app is by default in the language of the user's browser. This can be changed in the top right hand corner: https://app.formworkflowplus.com/