gui, script: Fix indentation in lang-en.json to match others (#8721)

* Indent lang-en.json with four spaces as all other languages.

* Regenerate lang-en.json.

Removes two no longer used strings.

gui/default/assets/lang/lang-en.json

@@ -282,7 +282,6 @@
     "Preview": "Preview",
     "Preview Usage Report": "Preview Usage Report",
     "QR code": "QR code",
-   "QUIC": "QUIC",
     "QUIC LAN": "QUIC LAN",
     "QUIC WAN": "QUIC WAN",
     "QUIC connections are in most cases considered suboptimal": "QUIC connections are in most cases considered suboptimal",
@@ -293,7 +292,6 @@
     "Received data is already encrypted": "Received data is already encrypted",
     "Recent Changes": "Recent Changes",
     "Reduced by ignore patterns": "Reduced by ignore patterns",
-   "Relay": "Relay",
     "Relay LAN": "Relay LAN",
     "Relay WAN": "Relay WAN",
     "Release Notes": "Release Notes",