Mandarin is a big one outside of English. A lot of Chinese construction businesses are operating there now and much more housing geared towards the Chinese investors. Mixed commercial and residential towers have been and are being constructed.
They are coming to invest in land and realty. As well as tourism. The government has created special visa specifically geared towards them.
I’d also add that besides business and tourism, if you were thinking about getting into the medical field in the country than French would be a strong popular language to learn. Almost all medical doctors use French. All lab test results in the country are in French, and many terms that doctors use is French.