Update lib/locales/zh-cn.js

Co-Authored-By: Byron Zhu <byronz@users.noreply.github.com>

Author: boltomli

lib/locales/zh-cn.js

@@ -22,7 +22,7 @@ module.exports = {
         'Click to enter X axis title': '点击输入 X 轴的标题',                                  // plots/plots.js:435
         'Click to enter Y axis title': '点击输入 Y 轴的标题',                                  // plots/plots.js:436
         'Compare data on hover': '悬停时比较数据',                                             // components/modebar/buttons.js:167
-        'Double-click on legend to isolate one trace': '双击图例',                             // components/legend/handle_click.js:90
+        'Double-click on legend to isolate one trace': '双击图例来突显对应轨迹',     
         'Double-click to zoom back out': '双击返回缩小显示',                                   // plots/cartesian/dragbox.js:299
         'Download plot as a png': '下载图表为 PNG',                                            // components/modebar/buttons.js:52
         'Download plot': '下载图表',                                                           // components/modebar/buttons.js:53