Duplicate messages about file handling

[Andrew Coles]

I've noticed that a lot of applications, pretty much anything that can save a 
file to disk, has messages to do with file IO errors - file is 
write-protected, cannot write to directory... - and so on.  They're also 
quite liable to having typos in them (exclamation points, can't,...).

Is there a good home for these messages in one of the libraries, where they 
could be written and translated once and for all?

Andrew