…tials table

See:
https://angular-translate.github.io/docs/#/guide/08_fallback-languages

Instead, apply the namespace separation only if the ID is set explicitly rather
than inferred to equal the value.

Since this is an object structure, rather than a comma-separated list of
strings, it's shown in the Advanced Settings as "[Object object]". Of course,
any attempt to edit this value makes the config fail to parse when saved.

…ady()

Array.filter is already used elsewhere in the file.

This will make it easier to merge main into the `webauthn` branch (PR syncthing#9175), as
there are about to be several services and API handlers that read and set
cookies and session state.

…gine

- Value assigned to a variable is never read before being overwritten:
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/SCC-SA4006?listindex=0

- Inappropriate usage of t.Parallel() method:
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/GO-W6007?listindex=1

- Found time.Now().Sub(t) instead of time.Since(t)
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/SCC-S1012?listindex=2

- Unsupported argument to functions in encoding/binary
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/SCC-SA1003?listindex=3

- Unused code
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/SCC-U1000?listindex=4

- Empty string test can be improved
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/CRT-A0004?listindex=6

- Unused method receiver
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/RVV-B0013?listindex=8

- Method modifies receiver
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/RVV-B0006?listindex=9

- Type "WebauthnCredential" has both value and pointer receivers
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/GO-W1029?listindex=10

- Unused parameter in function
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/RVV-B0012?listindex=11

- Use %q to quote a string in fmt.Sprintf format specifiers
  https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/GO-R4002?listindex=12

Hopefully fixes DeepSource lint: `func TestWebauthnRegistration has a
cyclomatic complexity of 38 with "very-high" risk`

https://app.deepsource.com/gh/syncthing/syncthing/run/20c38634-2a03-43a5-b47d-da9564205a82/go/GO-R1005?listindex=13

- Inappropriate usage of t.Parallel() method
  https://app.deepsource.com/gh/syncthing/syncthing/run/da7c6acc-3750-4921-be99-e21f1113387e/go/GO-W6007?listindex=0

- append possibly assigns to a wrong variable
  https://app.deepsource.com/gh/syncthing/syncthing/run/da7c6acc-3750-4921-be99-e21f1113387e/go/CRT-D0001?listindex=4

TestWebauthnConfigChanges seems to need a longer shutdown timeout when running
on GitHub Actions. The problem manifests in errors like this:

```
2024-05-05T17:00:45.0503602Z     api_test.go:2919: TestWebauthnConfigChanges/Can_edit_GUIConfiguration.WebauthnUserId Put "http://127.0.0.1:37585/rest/config/gui": EOF []
2024-05-05T17:00:45.0566336Z --- FAIL: TestWebauthnConfigChanges/Can_edit_GUIConfiguration.WebauthnUserId (0.52s)
```

indicating that the server was forcefully shut down (or panicked, but that was
ruled out in these cases) before the request was fully written.