Add Language Packs to Image VMs
Windows 10 Multi-Session images only come with English pre-installed. To support other languages for your AVD users, you need to install the language packs directly on the Desktop Images that your host pools are based on.
Warning: Installing language packs incorrectly via other means, such as pre-existing GPOs, can cause Sysprep to fail. Language packs must be installed in a manner that Windows 10 multi-session supports.
Nerdio recommends following a similar procedure to Microsoft's process as described here: https://docs.microsoft.com/en-us/azure/virtual-desktop/language-packs.
Note: Instead of initiating the Sysprep on the image VM itself, you should initiate it from the Nerdio Manager Desktop Images page. See Desktop Images Set as Image for details.
Tip: See this Microsoft document for file share requirements. You can add a file share to the existing storage account you may already be using for FSLogix.