Add about panel in settings dialog (#799)

* basic about page

* Remove frontend version from setting dialog header

* Style about page

* basic system stats

* Basic styling

* Reword

* Format memory amount

src/i18n.ts

@@ -2,6 +2,9 @@ import { createI18n } from 'vue-i18n'
 
 const messages = {
   en: {
+    systemInfo: 'System Info',
+    devices: 'Devices',
+    about: 'About',
     add: 'Add',
     confirm: 'Confirm',
     reset: 'Reset',