Five languages to account for

Question

Here's another connect wall, with the usual goal of putting four words into Group One, another four words into Group Two, four more into Group Three, and four into Group Four. This puzzle is also misleading—at first it looks like it's just grouping the words by language, but the number of languages is too big and the number of words in each language too small. What's going on, do you reckon?

Hint:

The languages do ultimately matter, but the meanings of the words don't matter….

avfyra	chiquilicuatro	detta	едва
entzweien	Erdreich	Klavier	kortvåg
lagunosa	megkettőzés	megye	острие
родина	sastresa	strejk	vonósnégyes

Answer 1

What's going on, do you reckon?

It's right there in the question: "the number of languages". Each non-English word contains, as a substring, a numeral in the same language.

Group One

detta, Swedish, ett, one
lagunosa, Spanish, uno, one
megye, Hungarian, egy, one
родина, Russian, один, one

Group Two

едва, Russian, два, two
entzweien, German, zwei, two
kortvåg, Swedish, två, two
megkettőzés, Hungarian, kettő, two

Group Three

Erdreich, German, drei, three
острие, Russian, три, three
sastresa, Spanish, tres, three
strejk, Swedish, tre, three

Group Four

avfyra, Swedish, fyra, four
chiquilicuatro, Spanish, cuatro, four
Klavier, German, vier, four
vonósnégyes, Hungarian, négy, four