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Some legacy components (like old Control Panel applets) may remain in the original language until a full reboot.
For enterprise users, air-gapped PCs, or multiple deployments, use the Microsoft Update Catalog.
Speech Recognition: Allows for voice commands in that specific language.
Since language packs are delivered via the update infrastructure, fixing Windows Update often fixes language issues. Go to Settings > Update & Security > Troubleshoot > Additional troubleshooters > Windows Update. Clear the SoftwareDistribution Folder