Issue:

The Non-Breaking Space ( ) character is used in place of the comma or space while using some non-english localization on your OS. This character is not supported correctly by Minecraft.

Workaround for the user is to use some compatible english regional format for your OS

Pictures:

While using US localization on OS:

While using Non-english localization on OS:

Finnish is used for this examble. Seems to happen with any localization which uses a space instead of comma as separator between digits

Related issues:

https://bugs.mojang.com/browse/MC-2595

SlimeKnights/TinkersConstruct#2608

MinecraftForge/MinecraftForge#3521

Team-EnderIO/EnderIO#72 (comment)

Mod version:

Minecraft 1.19.2
Forge 43.1.47
IC2C 2.0.0

Wow. Ok this should be addressed in the next patch.
We know english and german work fine since these were the development languages.

This will be addressed in the next patch.

Thank you for the report.