using convenience function for paying attention to verbosity tokens

src/commands/CmdModify.cpp

@@ -72,7 +72,7 @@ int CmdModify::execute (std::string&)
 
   auto count = 0;
   if(filtered.size() > 1) {
-    std::cout << "This command will alter " << format(filtered.size()) << " tasks." << std::endl;
+    feedback_affected("This command will alter {1} tasks.", filtered.size());
   }
   for (auto& task : filtered)
   {