Allow a content type only once (Only One) (7.x-1.13) - en to eu translation catalogue (4 entries)

en: Save configuration
eu: Gorde konfigurazioa

en: Content
eu: Edukia

en: The configuration options have been saved.
eu: Konfigurazio aukerak gorde dira.

en: Language neutral
eu: Hizkuntza neutroa
