Less confusing 404 errors from /random endpoint

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Before this fix the /random endpoint could return a 404 Not Found page
saying

  The requested URL "/random" was not found on this server.

Error cases producing such a result were:

- `/random?content=NON-EXISTING-BOOK` (can happen when a server is
restarted or the library is reloaded and the current book is no longer
available).

- Failure of the libkiwix routine for picking a random article.

Now a proper message is shown for each of those cases.

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f