Changing game manifests after downloading depots

[SpaceChihuahua]

I just started using DepotDownloader and I have one question. And I'll start with an example. As a test I try to change language in CoD:Warzone. For this I need to download 2 depots and install them. But steam won't recognise they are installed because you need to edit game manifest (add depots' ids and change "language" params).
If I try to launch the game after installing depots, steam runs quick validation and deletes depots I just installed. But if I change the game manifest, game runs how I need (language changes and steam doesn't perform any validations).
Can DepotDownloader edit game manifest in order to apply changes that were made to the game? Or I need to do it manually?