Adds a working language to the TermStore object.
Assembly: Microsoft.SharePoint.Taxonomy (in Microsoft.SharePoint.Taxonomy.dll)
The current user has insufficient permissions to perform this operation.
Adding additional working languages enables Label objects to be added to Term objects in multiple languages, enables the addition of multiple languages for TermSet names, and so on. The current user must have TaxonomyRights.ManageTermStore permission to use this method. Call the CommitAll() method to save this change to the database.