fix bus line translation

      // 配置表，每条线路单独定义方向映射 & 颜色

      const routeConfig = {

        XYBS1: {

          name: '1',

          name: 'L1',

          directions: { '0': '欣园 Joy Highland', '1': '工学院 COE' },

          color: '#f7911d'

        },

        XYBS2: {

          name: '2',

          name: 'L2',

          directions: { '0': '欣园 Joy Highland', '1': '科研楼' },

          color: '#29abe2'

        },

      const html = `

        <div class="bus-popup">

          <div class="plate">${bus.id.slice(2)} (${bus.speed} km/h)</div>

          <div><span class="line-tag" style="background-color:${color}">Line ${lineNum}</span> To: <strong>${direction}</strong></div>

          <div><span class="line-tag" style="background-color:${color}">${lineNum}</span> To: <strong>${direction}</strong></div>

          <div>Next: <strong>${bus.next_station_string}</strong></div>

        </div>

      `;