Watchdog Prune (8.x-2.2) - en to sk translation catalogue (5 entries)

en: 2 months
sk: 2 mesiace

en: 3 months
sk: 3 mesiace

en: 6 months
sk: 6 mesiacov

en: 9 months
sk: 9 mesiacov

en: 1 month
sk: 1 mesiac
