Added a simple free text search to the countdown page. You can also specify the search category.
Things checked in the search:
- Names, nicknames, artist names - full or partial, in both western and family-first order
- Groups or group tags
- Birthplace (town, country, etc)
- Birthdate (for now, with the syntax YYYY-MM-DD only, or parts of it... for example 1979 would work)