Fixed small grammar error in "package was unlisted/listed" text
Fixed small grammar error in "package was unlisted/listed" text

skbkontur/NuGetGallery,skbkontur/NuGetGallery,KuduApps/NuGetGallery,KuduApps/NuGetGallery,skbkontur/NuGetGallery,projectkudu/SiteExtensionGallery,projectkudu/SiteExtensionGallery,JetBrains/ReSharperGallery,KuduApps/NuGetGallery,projectkudu/SiteExtensionGallery,JetBrains/ReSharperGallery,grenade/NuGetGallery_download-count-patch,ScottShingler/NuGetGallery,mtian/SiteExtensionGallery,mtian/SiteExtensionGallery,grenade/NuGetGallery_download-count-patch,JetBrains/ReSharperGallery,KuduApps/NuGetGallery,mtian/SiteExtensionGallery,grenade/NuGetGallery_download-count-patch,ScottShingler/NuGetGallery,ScottShingler/NuGetGallery,KuduApps/NuGetGallery