PARIS—Qatar Airways took a spiraling $4 million-a-day dispute with Europe’s Airbus to social media on Friday, publishing a video of the scarred exterior of grounded A350 jets that the airline said underscored “serious and legitimate safety concerns.” The two companies have been locked for months in a dispute over deterioration to paint and anti lightning protection on the long-haul jets, which Airbus has acknowledged needs attention while insisting it does not put safety at risk. Qatar Airways hit back with the first official images of jets grounded by its national regulator in a bid to keep the spotlight on technical matters after Airbus accused the state-owned airline of engineering the dispute to obtain compensation. The dispute has led to the grounding of 21 planes out of 53 A350s operated by Qatar Airways and cast a pall over the airline’s preparations for the World Cup later this year. The airline says …