in american English

"Claimant" means "reclamant". The term is also used in other legal proceedings. As you can see, if it is necessary to mention that the claimant is filing for divorce, you can also say "divorce claimant". You can also check www.granddictionnaire.com, although you can find the French and not the Romanian equivalent.

http://www.mslawyer.com/mssc/cases/20020228/0100098.html
A divorce claimant must prove the allegations of the complaint, even when the defendant has failed to answer.
http://www.ssa.gov/OP_Home/rulings/oasi/53/SSR86-13-oasi-53....
The claimant married the worker in 1940 and divorced him in Texas in 1955. Despite the divorce, the claimant and the worker continued to live together and to hold themselves out to the public as husband and wife until 1960 when they separated and the claimant moved to Indiana.

In US sentences it is written this way(the opposite is respondent/defendant). If your translation is meant for another country, write just plaintiff.