I installed i18n with variables translation, updated my settings.php file according to this post. Cleared cache ofc. But on page
admin/config/user-interface/lightbox2 in text settings, there is nothing about variables being multilingual. They show just one version in all languages.
Also, on page
admin/config/regional/i18n/variable, there are no lightbox2 variables. (not sure if they should be here, perhaps yes)
I don't have an idea where to look further.