Update bug_report.md

Author: SQLiteFlow

.github/ISSUE_TEMPLATE/bug_report.md

@@ -8,8 +8,8 @@ assignees: ''
 ---
 
 **Version**
- - OS: [e.g. macOS 10.14.4]
- - App version: [e.g. 3.5.4]
+ - System: [e.g. macOS 10.14.4]
+ - App: [e.g. 3.5.4]
 
 **Steps to Reproduce**