i18n: replace "wiki" by "project"

Spotted by Siebrand
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Mwoauth-invalid-access-wrongwiki/en

Change-Id: I8f9e8129aa5cb59c402cb20b37189a1848d37eab
Merge "i18n: replace "wiki" by "project""