RCP: X.X, translate messages

Externalize and translate the new messages of the Analec extension

(from redmine: issue id 2165, created on 2017/04/25 by Matthieu Decorde)

added messages type::task + 1 deleted label

changed milestone to %TXM Annotation URS 3.0

first pass done

(from redmine: written on 2019/06/13 by Matthieu Decorde)

closed

assigned to @mdecorde