declension()
Returns the correct word form based on the provided count.
Examples:
ts
declension(1, ['slovo', 'slova', 'slov']) // 'slovo'ts
declension(2, ['slovo', 'slova', 'slov']) // 'slova'ts
declension(5, ['slovo', 'slova', 'slov']) // 'slov'