There are a number of different components involved in this Task as those names come from: MediaWiki core, Scribunto, Gadgets and Site-requests for the local/custom namespaces. The current list of namespaces for diqwiki (and diq language in general) is at P44675.

@Aklapper shall this Task be split per-component?

I don't have a strong opinion about this. Docs I'm aware of are https://wikitech.wikimedia.org/wiki/Wikimedia_site_requests#Change_the_translation_of_a_namespace

There are indeed two parts on this request:

• First, translation specific to the wiki -> that can be for configuration
• Secondly, translation for MediaWiki itself, like Kategori > Kategoriye, that should perhaps be done as localisation level, so everyone can benefit of this

(both can be done on that task, as Phabricator allows several tags/projects)