Как добавить язык и сменить язык системы через PowerShell?

1) Install the OS in the primary language

2) Copy the language pack you want (pay attention about architecture) from: Language Pack (ссылка нерабочая)

3) Copy the lp_xxxxxxxx.cab (where xxxxxxx are numbers and letters) in C:\Users\Public\ folder.

4) Rename lp_xxxxxxxx.cab into lp.cab

5) Run as admin the cmd prompt

6) Type: DISM /Online /Add-Package /PackagePath:C:\Users\Public\lp.cab

7) Wait until the end of the installation

8) Reboot

9) Enjoy

DISM /Online /Add-Package /PackagePath:C:\ru.cab

Deployment Image Servicing and Management tool
Version: 10.0.17763.1

Image Version: 10.0.17763.195

Processing 1 of 1 - Adding package Microsoft-Windows-Client-LanguagePack-Package~31bf3856ad364e35~x86~ru-RU~10.0.17134.1
[==========================100.0%==========================]

Error: 0x800f081e

The specified package is not applicable to this image.

Beginning with the next major release of Windows 10, we are going to support LIPs as Local Experience Packs only. There will no longer be any lp.cab files for LIP. Local Experience Packs are faster to install and have a smaller operating system (OS) footprint. If you create Windows images with LIP, you will have to add the corresponding LXP for that LIP. For full languages, there is no change and you will continue to use the corresponding lp.cab.

You can start testing Windows image creation using LXPs using Windows 10 Build 17723 or higher EEAP builds. We are providing LXP AppX packages and their corresponding licenses for all 72 LIPs in the language pack ISOs.

The process will work like this. First, you will need to use the Add-ProvisionedAppXPackage cmdlet to add a Local Experience Pack to your Windows 10 image. Once you have added the Local Experience Pack to your image, you should see the following behavior.

The LXP will show up on the language selection screen of the out-of-box experience (OOBE).
When you select the LXP, all subsequent screens of the OOBE will be in the corresponding language. Since the LXP has only a subset of operating system strings available, some of the content in OOBE may fall back to the base language. This is on parity with current behavior.
The first login experience post-OOBE should be in the selected language.
Note: The main difference between LIP and LP is in the level of localization in comparison to Language Pack (LP) packages: LIP packages provide the desktop user with the most frequently accessed user interface and basic user assistance support (help files). In addition, LIP is installed as a language add-on on top of an existing LP with base language dependency (Catalan LIP can only be installed on top of Spanish or French LP, Welsh LIP can only be installed on top of English LP). In addition, once a LIP is installed, switching the user interface between the LIP language and the LP base language is possible for users on all versions of Windows.

LIP relies on the same resource-loading technology that MUI LP is built on, and installs ontop of one base LP (in most cases).

Local Experience Packs are AppX packages delivered via the Microsoft Store