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README.md

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 - Translation keys are generated at compile time. Missing keys (from the invariant) will show up as compiler errors.
 - [Markup extension](https://docs.avaloniaui.net/docs/concepts/markupextensions) for simple usage
 - Simple translation file format based on [TOML](https://toml.io/en/)
+- Multiple translation files, so you can split translations by feature, ..
 
 ### Getting Started