It is possible to play Football Manager in a language that isn’t supported in the default version.
For Steam users, you can find many custom language files available to download on Steam Workshop.
For those who want to either learn or refine the skills of editing/creating game language files for Football Manager, we have created basic and advanced guidelines to support you.
If you wish to localise the data language in FM, please visit the ‘Translating Entities Using The Football Manager 2023 Editor’ section in the Advanced Guidelines.
Resources:
Basic Guidelines: https://fm23.info/BasicGuidelines
Advanced Guidelines: https://fm23.info/AdvancedGuidelines