Layout.convert

A copy of formatStr in which the items have been replaced by the string equivalent of the arguments.

Remarks: The formatStr parameter is embedded with format items of the form:

{index[,alignment][:format-string]}

• index
  An integer indicating the element in a list to format.
• alignment
  An optional integer indicating the minimum width. The result is padded with spaces if the length of the value is less than alignment.
• _format-string
  An optional string of formatting codes.

The leading and trailing braces are required. To include a literal brace character, use two leading or trailing brace characters.

If formatStr is "{0} bottles of beer on the wall" and the argument is an int with the value of 99, the return value will be:
"99 bottles of beer on the wall".