update to japanese

src/containers/_nav.js

@@ -3,18 +3,18 @@ import CIcon from '@coreui/icons-react'
 
 const _nav = [{
         _tag: 'CSidebarNavItem',
-        name: 'Dashboard',
+        name: 'ダッシュボード',
         to: '/dashboard',
         icon: < CIcon name = "cil-speedometer"
         customClasses = "c-sidebar-nav-icon" / >
     },
     {
         _tag: 'CSidebarNavTitle',
-        _children: ['Reports']
+        _children: ['レポート']
     },
     {
         _tag: 'CSidebarNavItem',
-        name: 'Download reports',
+        name: '報告書',
         to: '/reports',
         icon: 'cil-drop',
     },