Pontoon: Update Czech (cs) localization of AMO Linter
Pontoon: Update Czech (cs) localization of AMO Linter

Localization authors:
- Michal Vašíček <michalvasicek@icloud.com>
- Filip Havlík <Filip886@seznam.cz>

mozilla/addons-linter,mozilla/addons-linter,mozilla/addons-validator