babel naustrian is not detected as austrian german

[456Xander]

Describe the bug
When using LaTeX and babel, the language should be detected automatically.
Using babel with ngerman, the language is correctly detected as de-DE.
However, when writing documents in austrian German (babel naustrian), the language gets wrongly detected as en-US.
The detected language should be de-AT.

Steps to reproduce
Create a Latex document and use

\usepackage[naustrian]{babel}

Expected behavior
Language gets detected as de-AT.

Sample document

\usepackage[naustrian]{babel}
\documentclass[a4paper]{scrartcl}
\begin{document}
Das ist ein korrekter Satz.
\end{document}

LTeX configuration

Using ltex with neovim and nvim-lspconfig. Configuration is provided by Spacevim.

LTeX LS log
Paste the log (output) of LTeX LS here:

[ERROR][2023-01-06 12:27:53] .../vim/lsp/rpc.lua:733	"rpc"	"ltex-ls"	"stderr"	"Jan 06, 2023 12:27:53 PM org.bsplines.ltexls.server.DocumentChecker logTextToBeChecked\nFINE: Checking the following text in language 'en-US' via LanguageTool: \" Das ist ein korrekter Satz. \"\n"
[ERROR][2023-01-06 12:27:53] .../vim/lsp/rpc.lua:733	"rpc"	"ltex-ls"	"stderr"	"Jan 06, 2023 12:27:53 PM org.bsplines.ltexls.server.DocumentChecker checkAnnotatedTextFragment\nFINE: Obtained 5 rule matches\n"

Version information
List here the version information of the relevant software.

• Operating system: Arch Linux
• ltex-ls: 15.2.0-1
• Java: 17.0.5

[valentjn]

Fixed in 1a903cd.

[github-actions]

This issue is now fixed on develop. The fix will be included in the next release of LT_EX.

If you don't want to wait, you can try out the nightly pre-release tomorrow. Nightly pre-releases are published every morning at around 4am UTC.