PLT-6714: add /settings command (#6716)

* add /settings command

* update receiver name

i18n/en.json

@@ -659,6 +659,18 @@
     "id": "api.command_online.success",
     "translation": "You are now online"
   },
+  {
+    "id": "api.command_settings.desc",
+    "translation": "Open the Account Settings dialog"
+  },
+  {
+    "id": "api.command_settings.name",
+    "translation": "settings"
+  },
+  {
+    "id": "api.command_settings.unsupported.app_error",
+    "translation": "The settings command is not supported on your device"
+  },
   {
     "id": "api.command_shortcuts.browser.channel_next",
     "translation": "{{.ChannelNextCmd}}: Next channel in your history\n"