Collect more data

[chris48s]

When we append the tracking params in

WhereDoIVote-Widget/src/api/DemocracyClubAPIHandler.js

Lines 36 to 45 in 71c7250

	let utm_source;
	try {
	utm_source = window.location.href;
	} catch (e) {
	utm_source = 'unknown';
	}
	const params = { utm_source, utm_medium: 'widget' };
	if (api_key) {
	params.auth_token = api_key;
	}

it would also be useful to collect:

• candidates: on/off
• the user's language: English/Welsh

[chris48s]

Worth noting here that even if you don't actually do anything with additional params, just sending them on the query string is enough to make them visible to CloudWatch when you pull the stats on requests from there