Translating a Fiori app's resource model depends on the specific context and tools being used to develop and deploy the app. However, here are some general guidelines that can be helpful.
Identify the resource model file(s) that need to be translated.
Determine the source language and target language(s) for translation.
Choose a translation method and tool compatible with the resource model file format.
Create a translation glossary for consistency.
Test the translated resource model files in the app.
Continuously update the translated resource model files as needed.