Pontoon: Update Czech (cs) localization of MDN
Pontoon: Update Czech (cs) localization of MDN

Localization authors:
- Tomáš Zelina <zelitomas@gmail.com>

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