In the topic description editor, the format options "Heading X" are blank/missing in the Czech variant. I translated and fixed few other Czech translations but I can't find these.
There are also two more missing texts when adding a link (name of the action and text in the dialog).
We've fixed the problem. Now all texts are translated.
The redactor's translation is not available for contributors. If you see some untranslated text in redactor's actions please let us know include translation. We will fix it.