Handling obsolete messages
Fixed wrong count
Don't completely remove obsolete strings
Fixed quote
Fixed only last extension being processed
Updated translations and marked obsolete strings
Merge branch 'master' into bjoern

Conflicts:
	librarian/locales/ar/LC_MESSAGES/librarian.po
	librarian/locales/da/LC_MESSAGES/librarian.po
	librarian/locales/de/LC_MESSAGES/librarian.po
	librarian/locales/en/LC_MESSAGES/librarian.po
	librarian/locales/es/LC_MESSAGES/librarian.po
	librarian/locales/fr/LC_MESSAGES/librarian.po
	librarian/locales/hi/LC_MESSAGES/librarian.po
	librarian/locales/it/LC_MESSAGES/librarian.po
	librarian/locales/jp/LC_MESSAGES/librarian.po
	librarian/locales/librarian.pot
	librarian/locales/nb/LC_MESSAGES/librarian.po
	librarian/locales/nl/LC_MESSAGES/librarian.po
	librarian/locales/pt/LC_MESSAGES/librarian.po
	librarian/locales/sr/LC_MESSAGES/librarian.po
	librarian/locales/sv/LC_MESSAGES/librarian.po
	librarian/locales/ta/LC_MESSAGES/librarian.po
	librarian/locales/tr/LC_MESSAGES/librarian.po
	librarian/locales/zh/LC_MESSAGES/librarian.po