danielbgd Since obviously not all countries (like Poland) have a formatting frequency standard as I said, then my suggestion is to add an option in the radio app settings to choose the formatting style (dot or comma), not to use system default Locale settings
Addition once again since I can edit my post:
In the Serbian language, two letters are officially used, Latin and Cyrillic
sr_ [Serbian]
sr_ [Serbian (Cyrillic)]
sr_BA [Serbian (Cyrillic,Bosnia and Herzegovina)]
sr_ME [Serbian (Cyrillic,Montenegro)]
sr_RS [Serbian (Cyrillic,Serbia)]
sr_XK [Serbian (Cyrillic,Kosovo)]
sr_ [Serbian (Latin)]
sr_BA [Serbian (Latin,Bosnia and Herzegovina)]
sr_ME [Serbian (Latin,Montenegro)]
sr_RS [Serbian (Latin,Serbia)]
sr_XK [Serbian (Latin,Kosovo)]
So for example if you set serbian Latin Locale there will be dot but if you set Cyrillic there will be comma
And standard for Serbian language for formatting radio frequency should be dot