unbreak rendering RSS of group news
Refreshed gettext files
Fix problem where updating an artifact would disable monitoring of this artifact for some users
Merge branch 'Branch_5_1' into Branch_5_2

Conflicts:
	src/www/tracker/tracker.php
Merge branch 'Branch_5_2'

Conflicts:
	src/common/widget/Widget_ProjectLatestNews.class.php

Ignored (refresh only):
	src/translations/bg.po
	src/translations/ca.po
	src/translations/de.po
	src/translations/el.po
	src/translations/en.po
	src/translations/eo.po
	src/translations/es.po
	src/translations/eu.po
	src/translations/fr.po
	src/translations/fusionforge.pot
	src/translations/gl.po
	src/translations/he.po
	src/translations/id.po
	src/translations/it.po
	src/translations/ja.po
	src/translations/ko.po
	src/translations/la.po
	src/translations/nb.po
	src/translations/nl.po
	src/translations/pl.po
	src/translations/pt.po
	src/translations/pt_BR.po
	src/translations/ru.po
	src/translations/sv.po
	src/translations/th.po
	src/translations/zh_CN.po
	src/translations/zh_TW.po
run ./tools/update-gettext-files.sh to refresh the .po files