apt-get install language-pack-en-base
Where en is the langcode.
By default locales are added with UTF-8 encoding, and are available to the system via nl_NL.UTF-8 or en_US.UTF-8.
In some environments, PHP coms to mind, this UTF-8 appendix isn't really common. We want to be able to access a local via the langcode only.
To make this possible you have to do the following:
Add a line for each langcode without the .UTF-8 appendix, but leav te UTF-8 after the space intact. The file for nl will look like this when we're done:
Recreate the locales with:
The locales are now available to the system without the UTF-8 extention.