Allow a content type only once (Only One) (7.x-1.9) - en to ug translation catalogue (4 entries)

en: Content
ug: مەزمۇن

en: Add content
ug: مەزمۇن قوشۇش

en: About
ug: ھەققىدە

en: Uses
ug: ئىشلىتىش
