Fix delete function in services.

src/accounts/account.service.ts

@@ -37,6 +37,6 @@ export class AccountService {
   }
 
   delete(account: Account): Observable<Account> {
-    return this.one(account.id).delete();
+    return this.one(account.id).remove();
   }
 }

src/operations/operation.service.ts

@@ -64,6 +64,6 @@ export class OperationService {
   }
 
   delete(operation: Operation): Observable<Operation> {
-    return this.one(operation.id).delete();
+    return this.one(operation.id).remove();
   }
 }