Since official Microsoft links are largely inactive, the is the primary source for these legacy files:

As Windows XP is an unsupported operating system, connecting it to the internet carries significant security risks. Ensure you have critical updates like KB4012583 installed to protect against known vulnerabilities.

Select Regional and Language Options , then click the Languages tab.

Various language-specific versions of the full Windows XP SP3 installation media are hosted, such as a 25-language collection . How to Install and Enable

Execute the .exe or mount the .iso file and follow the prompts. Note that some packs require you to be running a specific base language version of Windows XP.

If using an MUI, select your desired language from the dropdown menu under "Language used in menus and dialogs" and click Apply (a restart is usually required).

If you have the installation files, follow these steps to enable them: