Online Documentation for Data Comparer for SQL Server
The Language page is provided for managing Data Comparer localization files.
You can specify your own localization file by creating *.lng file similar to those available in the %program_directory%\Languages folder and place it there. After it your language will be added to the list of available languages.
In the Languages area the list of available languages and the names of the corresponding localization (*.lng) files is displayed. Here you can choose the preferable language.