This tells the compiler that this function takes a format string as a parameter, and returns a "similar" string with the same formatting operations. This allows the format string to "propagate" to prinf-file functions (including BString::SetToFormat) and the format string to be actually checked with the arguments passed to that function. Without this, all translated strings were not checked to match with their arguments. Change-Id: I5c3c5cbfe7dfede9a6f45cad47a7524f9138fac0 Reviewed-on: https://review.haiku-os.org/c/haiku/+/7663 Reviewed-by: Adrien Destugues <[email protected]> Haiku-Format: Haiku-format Bot <[email protected]> Reviewed-by: waddlesplash <[email protected]>