Does this need a bug report? Not clear if you can change this on Weblate.
The current plural rule in the .po file reads…
"Plural-Forms: nplurals=3; plural=n==1 ? 0 : n==2 ? 1 : 2;\n"
…but it should be…
"Plural-Forms: nplurals=5; plural=(n==1 ? 0 : n==2 ? 1 : n>=3 && n<=6 ? 2 : "
"n>=7 && n<=10 ? 3 : 4);\n"