Steps to replicate the issue (include links if applicable):
While working on T329046, it became apparent that the CSS in ext.translate.tag.languages.less[line 64-72], which is in charge of highlighting language links of pages that have not been translated, has no effect on the links.
Language links without a linked page appear blue. They subsequently have no translation progress icon which may create confusion when assessing the list of languages with translations.
What should have happened instead?:
Language links without translated pages should appear red.
Software version MW 1.40 with Vector 2022: