Lower Sorbian
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This page offers basic guidance on typesetting a LaTeX document in the Lower Sorbian language using the Latin script.
Support with the traditional way (ldf)
The Lower Sorbian language is supported in babel in the ‘classical’ way
based on a ldf file.See babel-sorbian for further details.
Support with ini locale file
Here is a minimal sample file with lowersorbian as the main language
(assuming luatex, which is the recommended engine, and babel ≥24.14,
although it may work with previous versions).
\documentclass[lowersorbian]{article}
\usepackage[provide=*]{babel}
\begin{document}
Local name $=$ dolnoserbšćina
Chapter $=$ \chaptername
Today $=$ \today
\end{document}

Contribute
If you are a native speaker or have expertise in this language, you can contribute, make suggestion or request an enhancement by submitting a pull request, opening an issue, or contacting the Babel maintainer with the link above.