Unfortunately, I am not familiar with this widget as it appears to be custom or third-party. It is not part of any version of Telligent Community.
Without knowing anything else about this, have you tried editing resource strings in the file identified in that widget's "File Name" field?
Would you be able to contact the vendor of this widget?
If unable to modify it, would you be able to use the "Generic Content" widget instead?
telligent.com/.../4137.general-widgets.aspx