What exactly are you wanting changing? Namespace names? Sitename?

bugs wrote:

I thought they were referring to the name of the actual language, so Names.php.

(In reply to comment #2)

I thought they were referring to the name of the actual language, so Names.php.

Hmm, maybe. Unclear report is unclear ;)

servien wrote:

I'm sorry if I was unclear. I meant the name used in interwiki links it currently reads "Nedersaksisch", this should be changed to "Nedersaksies".

Thehelpfulonewiki wrote:

Adding shell keyword.

@Thehelpfulone: this is not something that needs shell. It needs updating in Names.php and will then be deployed in the next WMF point release.

Aren't language names for interwikis now fetched from CLDR?
You should probably report the problem there. https://translatewiki.net/wiki/CLDR

Gerrit change 34514
http://unicode.org/cldr/trac/ticket/5466