Slovak suplementary data

[janik-martin]

The main aim is to cover shorthand relative dates when relating to "one". Similar to English, where 'a' is used, Slovak leaves out the slot entirely. So relative date 'o hodinu' means 'in an hour', which was not working. But 'o 1 hodinu' was working, this is rarely used in Slovak however. Also added forms of words used with count 2,3,4 - e.g. in 2 weeks -> o 2 týždne, but in 5 weeks -> o 5 týždňov. This is sometimes referred as "one, few, many" grouping, where English only uses one and many.