Hi @barta ,
When you use Text function to format a number value, it would generate a language code based on your local language. Currently, within PowerApps, there is no way to prevent this phenomenon from showing up.
If you would like the cs language code to be supported in PowerApps, please submit an idea to PowerApps Ideas Forum:
https://powerusers.microsoft.com/t5/Power-Apps-Ideas/idb-p/PowerAppsIdeas
If you would like to get further help in this issue, please consider submit an assisted support ticket through the following link:
https://powerapps.microsoft.com/en-us/support/pro
Best regards,
WarrenBelz
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RandyHayes
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Pstork1
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