Give existing boards default description texts

As #502 (closed) introduces description fields and #478 (closed) hides member images, it is probably desirable to provide default descriptions for the legacy boards. Either some manual work, or an automatic migration. See also #478 (comment 35279)

Bijv. 'The board of xxxx-yyyy was formed by John Doe (position), Jane Doe (position), etc.'

Edited May 23, 2018 by Sébastiaan Versteeg

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