getfmth - get month names
Getfmth returns a pointer to an array of 12 character pointers. Each of these pointers point to a null terminated string corresponding to the names of each month in the year (January through December).
The month names are retrieved from the country format structure (see fcountry(C-3)).
C/Base Reference Manual Chapter 13, "Formatting Data Values"
Getfmth is used instead of getfmonth to avoid possible name conflicts with getfmoney.