Help GitHub detect that your project is written in the Microsoft Dynamics 365 Business Central AL language.
The AL Language is used for developing and customizing the Microsoft Dynamics 365 Business Central solution.
It took a while before the AL language was recognized by GitHub and at first it was called AL Code, before it was renamed to AL.
This means that your older projects might be detected as written in Perl.
The solution is to add a new file in the root of your old AL projcts.
Name the file .gitattributes and insert the following line and save it.
*.al linguist-language=AL
You can add the file directly on GitHub by chosing Add file, Create new file. The project is then correctly detected as being an AL project and you can filter your GitHub repositories by the AL language.
https://github.com/finnpedersenkazes/HelloWorld
https://github.com/github/linguist/blob/master/docs/overrides.md