Hello.
Here you can download the Slovenian Flags for your FiveM server.
If you have any issue with the download or instalation tell me!
The proccess how to add it into FiveM server:
- Download the resource,
- Put it in the resocures folder,
- Write
start/ensure slo_flagsinto server.cfg, - Enjoy!
Have a nice day 
Preview:
Download resources:
Here