Real-Time French Speech Translation into Four Congolese National Languages Using Whisper and Language-Specific LoRA Adapters for NLLB-200

French is the sole official language of the Democratic Republic of the Congo, yet much of the population communicates daily in Lingala, Swahili, Tshiluba or Kikongo. This paper presents a cascaded system that transcribes spoken French with Whisper and translates it with NLLB-200-distilled-600M, specialized by one Low-Rank Adaptation (LoRA) adapter per target language on a shared frozen base model.