Also fix the incorrect date for the February low-hanging fruits
session.

Too many new contributors try to build from master.

Reviewed Muri's edits; Removed a period and changed "Stay tuned" into "Bleiben Sie auf dem Laufenden"

Conflicts:
	wiki/src/blueprint/evaluate_Docker.mdwn

I'm told it's useful when reviewing translation updates. Admittedly, it should
be removed before merging into master, but I'm told ikiwiki does that
automatically sometimes. In any case: no big deal, that check is really
pedantic, and our PO files can very well be in good shape even with stray
previous msgid's.