Updated to check empire_home_system in addition to the existing ars_renamed star flag. Should make sure empire home systems are protected from renaming, even if they side step the ars_renamed flag.

NOT = {
solar_system = {
OR = {
has_star_flag = ars_renamed
has_star_flag = empire_home_system
}
}
}

Updated set_name to new localized form in Dev Diary 253:
https://forum.paradoxplaza.com/forum/developer-diary/stellaris-dev-diary-253-three-in-one-3-4-cepheus-patch-notes-and-more.1523352/

Need to specify a localization key and variable string in the mod event:
set_name = { key = "ARS_System_Name" variable_string = "[ROOT.GetName]" }

Localization key needs to be set in a localization file to use bracket command successfully:
ARS_System_Name:0 "[ROOT.GetName]"

Version string updated to 3.1.*