Hello, the official language of Tanzania, and east africa is Swahili, not Kiswahili. Kiswahili is the Swahili version of the language Swahili.
Here is an example of Language name transalation from English to Swahili.
Language In English - - - Language in Swahili
French - - - Kifaransa
English - - - Kiingereza
German - - - Kijerumani
Swahili - - - Kiswahili
So the language itself is called Swahili, and it is the official language name. Which is also acceptable and recognized by people using the language as well, so you needn’t worry it being that way.
Changing it to Swahili will make it easier for people both in East Africa and Global users of manager.io find it and access it.
The reason i pointed it out is when someone is using English version of manager, they are most likely to search for Swahili and not Kiswahili. I had this problem when i first used manager.io before getting used to the system, so i assumed the language is not there. it wasnt until later on then i realized its written as Kiswahili.