Windows 8 language pack won't install

This problem is caused by corrupted files in WinSXS folder. This folder is very important for the system.
You should manage to fix issues in there with a simple command in Windows 8.

Steps:

• Press Win + X then choose Command Prompt (Admin) - we need admin priviligies to run the command.
  You now should see a black box with a prompt, please enter the following command:
  dism /online /cleanup-image /restorehealth
• It should take very long time to do that (30~60 minutes, it's depend on the corruption).
• You can find the log file in folder: %windir%\Logs\DISM\dism.logPlease scroll to the bottom, if there was no error you should see something like:

Checking System Update Readiness.


Summary:
Operation: Detect and Repair
Operation result: 0x0
Last Successful Step: Entire operation completes.
Total Detected Corruption: 0
CBS Manifest Corruption: 0
CBS Metadata Corruption: 0
CSI Manifest Corruption: 0
CSI Metadata Corruption: 0
CSI Payload Corruption: 0
Total Repaired Corruption: 0
CBS Manifest Repaired: 0
CSI Manifest Repaired: 0
CSI Payload Repaired: 0
CSI Store Metadata refreshed: True


If there was an error you can see which files are corrupted and how much of them the system can fix. You need to replace the corrupted files with the correct ones but this is for another topic.