Hide the current language

Yes, that should be possible using this module. Otherwise please file a new issue.

but where can i find the option "Hide the current language" ?

I can't see this feature on /admin/config/regional/language/language-switcher-extended

If I understand your request correctly this is what you're looking for.

@szeidler thanks but I think this is different question - I think your comment concerns if there is no translation for the current node then don't show the switcher because there is nothing to switch to.

My question is - my node has two languages English and Spanish - so for the English page I want the switcher to show the link to the Spanish page but not show the link to the English page (because I am already on the English page). And vice versa - if I am on the Spanish page I want the switcher to show the link to the English page but not show the link to the Spanish page (because I am already on the Spanish page).

I have just realised that I can do this with CSS =

.language-switcher-language-url ul.links li a.is-active {
 display: none;
}

Great, I haven't thought about it, but that's pragmatic.