Pontoon: Update Ukrainian (uk) localization of MDN
Pontoon: Update Ukrainian (uk) localization of MDN

Localization authors:
- Artem Polivanchuk <a.polivanchuk@outlook.com>

SphinxKnight/kuma,Elchi3/kuma,SphinxKnight/kuma,Elchi3/kuma,SphinxKnight/kuma,safwanrahman/kuma,jwhitlock/kuma,mozilla/kuma,escattone/kuma,a2sheppy/kuma,mozilla/kuma,a2sheppy/kuma,jwhitlock/kuma,mozilla/kuma,jwhitlock/kuma,Elchi3/kuma,SphinxKnight/kuma,Elchi3/kuma,safwanrahman/kuma,safwanrahman/kuma,a2sheppy/kuma,safwanrahman/kuma,jwhitlock/kuma,mozilla/kuma,escattone/kuma,safwanrahman/kuma,SphinxKnight/kuma,SphinxKnight/kuma,escattone/kuma,a2sheppy/kuma,mozilla/kuma,jwhitlock/kuma,a2sheppy/kuma,Elchi3/kuma,safwanrahman/kuma