English translation: to file a suit on one's own behalf
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Explanation: a suggestion. "Intervene" in English carries a connotation of acting on someone else's behalf, and XX has filed suit on his own behalf. "Volontaire", apart from "voluntary", also means deliberate.
Explanation: According to my Collins Robert French dictionary, "intervenir" just means "to intervene" in a legal context. And "volontairement" means "voluntarily" in a legal context also. So I think the translation is quite simply "XX intervened voluntarily etc."
Collins Robert French-English English-French Dictionary
Rowan Morrell New Zealand Local time: 17:57 Native speaker of: English