Confusing label translation on site domain adding/editing page [5.2.1-RC1]

Right now on site domain editing page we have "Language" and "Languages" field, which doesn't exactly say what the heck user must select in them and why (see image below):

In fact "Language" is selecting "Primary Language" of that site domain (also overrides primary language of website) and "Languages" selects languages, that user is allowed to switch do from language selection dropdown on Front-End.

Same situation is with "Theme" and "Themes" fields on same page. I guess translation were correct at some point, but then we renamed then for other form and on this form they became confusing.

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