ServerPlayer.clientInformation().language() returns language string as uppercase instead of expected lowercase

[MrSn0wy]

Describe the bug

When calling .clientInformation().language() on a ServerPlayer that is Java edition it returns the string as lowercase, however when calling this function on a ServerPlayer from Geyser it returns the string as uppercase.

To Reproduce

1. Obtain a ServerPlayer from a user joined using geyser
2. Call .clientInformation().language() on the ServerPlayer
3. Returns a string in UpperCase

Expected behaviour

It returns the string as LowerCase

Screenshots / Videos

No response

Server Version and Plugins

The Minecraft version is 1.21.4 and i'm using Neoforge 21.4.0-beta

Geyser Dump

https://dump.geysermc.org/5gzVlmUzUIed9uuMBb5zpkrRBSjuULIw

Geyser Version

2.6.0-b734 (git-master-64c7adc)

Minecraft: Bedrock Edition Device/Version

1.21.51.02, Android

Additional Context

No response

[MrSn0wy]

I forgot to clarify but the function clientInformation().language() is in mojang mappings, not in yarn or anything. (No clue what the equivalent would be in yarn or any other mappings)