How does it look in unminified version?

how I can translate marked part to non-minified version? It is minified Javascript:

function a(t, i){
   var u = null;
   t && (u = translate(t, i)); // <- This line
   //What value be 't'? And when 'u' will be translate(t, i)?
}

Solution

t && (u = translate(t, i));

...is taking advantage of the fact that boolean operators will short circuit once they can not possibly be true. So that code is the same as

if (t) {
    u = translate(t, i)
}

EDIT:

Ok thanks, and what about this please:

return te && te.translate ? te.translate(e, t, n) : t || e

That means:

if (te && te.translate) {
  return te.translate(e, t, n);
} else {
  return t || e;
}