Hello guys, just got a simple question, in rules (czech version translation), they write, that all heroes and overlord gets 1 XP point in the end of an encounter, no matter who won - in addition to the normal quest reward written in quest guide.

That means, that in First Blood quest, everyone gets 1+1 XP? Not just the 1 XP written in quest guide?

Nope, only 1xp

Forget the sentence from the rulebook and only looks to the reward of the quest

In the English rules, it's not "in addition to what's listed in the Quest Guide", it's "as listed in the Quest Guide".

This said, you can still house-rule a Zlatopramen beer as a reward to any quest you win.