Angela Merkel has called on campaigners in Britain’s EU referendum debate to moderate their language ahead of next week’s vote, as political leaders and officials across Europe paid tribute to the killed Labour MP Jo Cox. The German chancellor, who described the attack on the pro-European West Yorkshire MP as “terrible” but declined to link it directly to the referendum, called for all involved to respect the beliefs and opinions of others. “Otherwise, the radicalisation will become unstoppable,” she said. “Exaggerations, and radicalisation of part of the language, do not help foster an atmosphere of respect. We know how important...