Buttons are unusable in WHMCS client area for SolusVM 2 service if language other than English is set up for WHMCS

Symptoms

Buttons are unusable in the WHMCS client area for the SolusVM 2 service if a language other than English is set up for WHMCS

Cause

WHMCS module bug with ID #SIO-4991, which was fixed in module version 1.0.24

Additionally, bug SVM2-6379, the fix is available in 1.0.54 version of WHMCS module.

Resolution

The fixed module is already available at the marketplace.
As a workaround, temporarily use English.