I used this Launcher too, try to find a readme. If you pingaz'd it the same way as I used to, there IS a Readme explaining everything.
But, if I remember correctly, the first one on the left is for the campaign (first is Dead Center, second Dark Carnival, third Swamp Fever, fourth Hard Rain, fifth The Parish), first one on the right is for the levels of the campaigns.
Rest is unnecessary, except "Player". Enter your name there.
Then, most of all, click on the second start button to start. The one in the middle. Otherwise you won't have the console.
And no, there's no translation of this.

=- RND Graphical Design Team -=


Current GD team Members:
Krasher
CommanderEddy (I can already tell he will want to join, lol)
Frank
BrotherBlade -.-
Mastgrr
Razor