Update Czech translation (cms-dev#1190)

* Update Czech translation

* Fix Last-Translator field in Czech translation

* Fix forgotten translation and change different translation

Author: SvizelPritula

AUTHORS.txt

@@ -44,5 +44,6 @@ Kārlis Seņko <karlis3p70l1ij@gmail.com>
 Peyman Jabbarzade Ganje <peyman.jabarzade@gmail.com>
 Valentin Rosca <rosca.valentin2012@gmail.com>
 Alexander Kernozhitsky <sh200105@mail.ru>
+Benjamin Swart <Benjaminswart@email.cz>
 And many other people that didn't write code, but provided useful
 comments, suggestions and feedback. :-)