Add info_url to helmet events, if applicable

[Rikuoja]

No description provided.

[Rikuoja]

Hm. Looks like helmet data does not contain any URLs that we could use.

However, it seems that the www.helmet.fi service has an event page for each event: https://www.helmet.fi/fi-FI/content/189768/10657 . Here the format of the URL is https://www.helmet.fi/fi-FI/content/{event_id}/10657 in Finnish, https://www.helmet.fi/sv-FI/content/{event_id}/10657 in Swedish, https://www.helmet.fi/en-US/content/{event_id}/10657 in English and https://www.helmet.fi/ru-RU/content/{event_id}/10657 in Russian. No idea why there is 10657 at the end.

[aleksisalonen]

The url seems to require any number to work :)

So https://www.helmet.fi/fi-FI/content/189768/1 is kosher, but https://www.helmet.fi/fi-FI/content/189768/ is a big no-no.

I suppose there's some added benefit for the user, for example the info chat, at the end of that link. So we could use that.