We are using language strings but unfortunately we were not loading the language files!!
If you add this code
$lang->load("files_jeventsfloatlayout");
At line 40 of components/com_jevents/views/float/helpers/floatviewhelperheader16.php after
$lang = Factory::getLanguage();
It should allow you to pick up the translation for the float theme
p.s. This is included in the next release.