Requested at https://translatewiki.net/w/i.php?title=Support&oldid=12204527#Request_to_add_Petjo
Autonym: "Petjoh", according to the request in translatewiki and [[ https://meta.wikimedia.org/wiki/Requests_for_new_languages/Wikipedia_Petjo | meta ]]. There are no better sources, but this seems reasonable. If a better autonym is found, it can be changed.
[v] Add to language-data ([[ https://github.com/wikimedia/language-data/pull/335 | patch ]])
[v] Add to jquery.uls
[v] Add to translatewiki configuration ([[ https://gerrit.wikimedia.org/r/c/translatewiki/+/998437 | patch ]])
[v] Create portal on translatewiki
[v] Add the name to Wikimedia Portals
[v] Deploy configuration to translatewiki
[ ] Update jquery.uls in the ULS extension ([[ https://gerrit.wikimedia.org/r/1004310 | patch ]])
[ ] Deploy ULS to translatewiki