With the $user->lang() you can directly sprintf() into a language string.
This is useful, when you need different language-strings for different input (1 post, 3 posts, etc.)

Now the code says:

		// We now get the first number passed and will select the key based upon this number

but this is not correct. Currently it uses the last int, as it does not exit the loop of arguments.
this can be easily fixed by adding a break; after

				foreach ($numbers as $num)

				{

					if ($num > $args[$i])

					{

						break;

					}

					$key_found = $num;

				}