Microsoft lacks an easy way to set the language and keyboard options in Windows.
There are different articles, scripts, tools etc. out there to configure this.
I created my own custom Group Policy to set the default input language to Dutch and the keyboard to United States International.
Download the .ADM file here
How to apply this policy:
Restart the client or and log on with a user account that has the policy applied. Check the language options.
You can add/change/remove languages from the .ADM file using a text editor.