[Gimp-docs] meaning of strings in po files

[julien]

> These are the entries of <revhistory><revision>--..
> 
>> how are supposed to be translated and why?
> 
> Add your authorinitials and the date when you edited the po file?
> 
> But IMHO we should just remove these entries from the source files. They 
> don't contain any essential information, do they?

Perhaps users reading the HTML files want to know when the text has been
updated and who updated it?
But the <revnumber> is of no use. Can we delete it keeping the rest?

Julien