Steps to replicate the issue (include links if applicable):

• Go to https://www.wikidata.org/wiki/Special:NewLexeme?lexeme-language=Q1
• Open the spelling variant field and type "nd" or "nr".

What happens?:

The list shows ⧼wikibase-lexeme-language-name-nd⧽ and ⧼wikibase-lexeme-language-name-nr⧽.

What should have happened instead?:

The language names should be shown instead.

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

The codes were added in https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikibaseLexeme/+/828887/ without also adding the names to https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/WikibaseLexeme/+/refs/heads/master/i18n/language-names/en.json

Screenshot: