EU law says non-EU spouses of EU citizens enjoy free movement rights. They can move to an EU country* with their partner and work there without a visa.
What are the requirements for a marriage realized in a third country to be recognized regarding these rights?
Is a sworn translation of the marriage certificate enough? Can it be made in any country? Does the document need to go through some special process in a consulate before the couple enter the EU Country?
*Except if it's in the partner's country of nationality, in which case national law applies.