Sort on repo size in admin panel (#1654)

* fix #1653 sort on repo size

* fix minor mistake in en-us locale

routers/home.go

@@ -94,6 +94,10 @@ func RenderRepoSearch(ctx *context.Context, opts *RepoSearchOptions) {
 		orderBy = "name DESC"
 	case "alphabetically":
 		orderBy = "name ASC"
+	case "reversesize":
+		orderBy = "size DESC"
+	case "size":
+		orderBy = "size ASC"
 	default:
 		orderBy = "created_unix DESC"
 	}