Windows 7 lang, how can someone change keyboard?
You can add language to your Windows 7 language pack. First you should open control panel next region and language.
Choose to install/ uninstall language tab like above image. You can see the arrow near that tab.
Then go through the steps toward. You can see install display languages as below.
Then you should select it and next launch windows updates. Then you can see available language packs. Select what you want to install. Go to and allow to install updates and then you will be able to install and use new language pack.