Phrase language &1 does not exist in Customizing

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

You cannot use the phrase language &V1& for processing.

How to fix this error?

INCLUDE EHS_NA_ADMIN OBJECT DOKU ID TX

Procedure for System Administrators

INCLUDE EHS_NA_CHECK_CUSTOMIZING OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.