add declension of words

src/app/lib/pluralize.ts

@@ -0,0 +1,10 @@
+export const pluralize = (number: number, one: string, few: string, many: string) => {
+	const n = Math.abs(number) % 100;
+	const n1 = n % 10;
+
+	if (n > 10 && n < 20) return many; // 11-19
+	if (n1 > 1 && n1 < 5) return few;  // 2-4 (кроме 12-14)
+	if (n1 === 1) return one;  // 1 (кроме 11)
+
+	return many; // 0, 5-9, 10-20, 25-30 и т.д.
+};