Adds update to Czech translation
Updates #26802

Signed-off-by: Leah <leah.koerper@gmail.com>
Merge branch 'develop' of https://github.com/moderntribe/the-events-calendar into develop
Merge branch 'develop' of https://github.com/moderntribe/the-events-calendar into develop
Adds update to Greek translation
Adds new translator credit to readme.txt
Updates #26802

Signed-off-by: Leah <leah.koerper@gmail.com>