Pontoon: Update Czech (cs) localization of Firefox
Co-authored-by: Francesco Lodolo [:flod] <flod+pontoon@mozilla.com>
<!-- This Source Code Form is subject to the terms of the Mozilla Public
- License, v. 2.0. If a copy of the MPL was not distributed with this
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<!ENTITY editfield0.label "Uživatelské jméno:">
<!ENTITY editfield1.label "Heslo:">
<!ENTITY copyCmd.label "Kopírovat">
<!ENTITY copyCmd.accesskey "K">
<!ENTITY selectAllCmd.label "Vybrat vše">
<!ENTITY selectAllCmd.accesskey "a">
