Regional language for a secondary user (not master)

I am using Kodi 17.3. For a master user I installed KODI with a proper buid for children. The language I am using for interface is Hebrew.
I have defined an additional user, for which I intend to include contents for adults only.
The problem is that I do not see within the secondary user account in Settings,Interface, Regional – the Hebrew language.
Sometimes I see only English language in the list and sometimes I see a list of languages, – but Hebrew does not appear in the list.
I would expect to have the same list of languages as it is for the master user.
When I have created the secondary user I selected to build the user parameters from scratch,
The same problem appears for KODI 17.3 on Windows 7 and Android 6.