gencat
[option] database msgfilesAppend (or merge) messages contained in one or more msgfiles with the formatted message database file. If database doesn't exist, it is created. Each message in msgfile is preceded by a numerical identifier. Comment lines can be added by using a dollar sign at the beginning of a line, followed by a space or tab. See also genmsg and mkmsgs.
-m
Build a single database that is backward-compatible with databases created by earlier versions of gencat. SVR4 only.