Hello, im looking for a way to sync Umbraco localization and .NET localization. I want to use my resx files when i switch the language. I'm switching umbraco content language when i redirect to the site url with "/bg" segment after the host. If more information is needed please ask me to provide.

When you set a culture on a node it will set the frontend CurrentCulture (https://learn.microsoft.com/en-us/dotnet/api/system.globalization.cultureinfo.currentculture?view=net-7.0) to that languge. I can't remember how to use resx files but they should be using that I believe.