Add names for 2 letter codes

[tovmasharrison]

Description

I have added the names for two letter language codes. Afterward, I modified how the unlisted_langauges list is populated and resolved the duplicate articles for 3-letter codes bug. #567

Fixes #571

Checklist:

• [x] I have read the contributing guidelines.
• [x] I have followed the style guide.

[tovmasharrison]

@bittlingmayer jan, All done.

[cefoo]

Hey @tovmasharrison! Works well on my local copy. Thank you for your work!!

[tovmasharrison]

Hey @tovmasharrison! Works well on my local copy. Thank you for your work!!

Hi @cefoo!

It's great to hear that it's working as expected!

[bittlingmayer]

This seems wrong.

[tovmasharrison]

This seems wrong.

Fixed @bittlingmayer