Extend Choice formatter to support advanced cases in Slavic language groups

Doing a translation of this message to Ukrainian

    {0,choice,0#No|1#One|1<{0}} included {0,choice,0#documents.|1#document:|1}

I found that it's not possible to build proper translation due to limitations of standard ChoiceFormat.
The issue is related to

• the fact that nouns have different endings, depending on the last digit of the numeric
• an exception to the generic rule in case of 0, 11, 12, 13 and 14

Another formatter should be added, extending the Choice one, with support for the following more complex rules.
Assume given numeric X, following rules about the endings apply (in the listed order)

Similar (but not exact) rules apply to Russian.