MOTM-747: fix invalid date as parameter

Conflicts:
	newscoop/include/smarty/campsite_plugins/function.build_solr_fq.php
MOTM-747: ignore invalid date as parameter
Merge branch 'v4.2' of https://github.com/sourcefabric/Newscoop into v4.2.1
add missing translations
Merge pull request #370 from ahilles107/v4.2.1

Add few missing translations, add few Turkish translations.