Show a "No Events" label when there are no events in the filter dialog

Uses profile.c:evn_foreach() to retrieve the number of events, which
if zero, no table is added in the dialog and the label is added instead.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Updated PO files, again

This time for the new string in the Events Filter dialog adden in commit
66cb5ae00b68 ("Show a "No Events" label when there are no events in the
filter dialog")

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Update German and Swiss-German translations

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>