Added a number to the dashboard event view if there is more than one event

What does this MR do?

Just quickly added a number to the dashboard event view if there is more than one event. Sure it can be further improved by whoever wants to put work in it but I just want to quickly have a count there :)

How confident are you it won't break things if deployed?

Very.

Screenshots

Links to related issues

none

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))