How to just authorized one language

Thanks for providing the additional information in the help desk ticket. Here's the answer for other users:

If you want to get rid of the other language options, you will need to delete:

1) All the .xx.resx files (the xx is the two-character country code) under App_GlobalResources. These contain the non-embedded resource files.

2) All the xx subfolders under Bin (e.g. Bin\Fr) these contain the embedded language resource files.