highchart with unicode names

highchart_unicode.js

{
  chart: {
    style: {
      color: "#b9bbbb"
    },
    renderTo: "container",
    backgroundColor: "transparent",
    lineColor: "rgba(35,37,38,100)",
    plotShadow: false
  },
  credits: {
    enabled: false
  },
  title: {
    style: {
      color: "#b9bbbb"
    },
    text: "Średnia miesięczna temperatura"
  },
  xAxis: {
    categories: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
  },
  yAxis: {
    title: {
      style: {
        color: "#b9bbbb"
      },
      text: "泽东6"
    }
  },
  legend: {
    itemStyle: {
      color: "#b9bbbb"
    },
    layout: "vertical",
    align: "right",
    verticalAlign: "middle",
    borderWidth: 0
  },
  series: [{
    color: "#108ec5",
    name: "ابن خلدون",
    data: [17.0, 22.0, 24.8, 24.1, 20.1, 14.1, 8.6, 2.5]
  }, {
    color: "#52b238",
    name: "田中太郎",
    data: [13.5, 17.0, 18.6, 17.9, 14.3, 9.0, 3.9, 1.0]
  }, {
    color: "#ee5728",
    name: "Ærøskøbing",
    data: [11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
  }]
}