When adding an ADMX template for a different language than the language of the Operating System in use, you may come across the following error.
Cannot find any language specific resource directories in the following location
This behavior is expected and is due to the language-specific resource file not being present on the machine. This is because the only language-specific resource file available is that of the native operating system language. Adding a new language to a set of policy definitions is achieved by ensuring that the language-specific resource file is available.
This is explained in the Microsoft article below.