Unzip and upload this file to components/com_jevents/libraries/jeventshtml.php and it will remove this.

The idea behind marking the language was for sites with a mixture of language specific categories and any-language categories. This change will hide this marker for categories matching the language being viewed when filtering BUT retains it for event editing.

Thank you. The file didn´t have any effect (I cleaned Joomla and browser cache).

Anyway, the more I think about it....I think, I will assign all my categories to "all languages", since there is no real need to assign the categories to specific languages. So... thank you anyway!