chore: fix issue form [skip ci]

Author: Justineo

.github/ISSUE_TEMPLATE/bug-report.en-US.yml

@@ -8,7 +8,8 @@ body:
   - type: checkboxes
     id: confirmation
     attributes:
-      description: Before submitting the issue, please make sure you did the following check.
+      label: Confirmation
+      description: Before submitting this issue, please make sure that the problem only occurs in Vue-ECharts and is not related to ECharts itself.
       options:
         - label: I can confirm this problem is not reproducible with ECharts itself.
           required: true

.github/ISSUE_TEMPLATE/bug-report.zh-Hans.yml

@@ -8,7 +8,8 @@ body:
   - type: checkboxes
     id: confirmation
     attributes:
-      description: 在提交此问题前，请确认下述情况。
+      label: 请确认
+      description: 在提交此问题前，请确认问题仅在 Vue-ECharts 中发生，而与 ECharts 本身无关。
       options:
         - label: 我可以确认这个问题无法在 ECharts 项目本身中复现。
           required: true