What you're proposing is to try to fix something that is needlessly broken to begin with. It would be better if you could avoid this problem in the first place, by simply logging different language messages to different logs, possibly bearing such catchy file names as "japanese.log", "german.log", and so on.

If this isn't feasible (your PHB wrote the script and wants you to use it), then you will probably need to pull this log apart, line-by-line, like so:

if ($line =~/JAP/) {
     # Logic to print to the Japanese file...;
      }
elsif ($line =~/GER/) {
     # Logic to print to the German file...;
      }
else { 
     # Logic to print to the English file...;
     };
[download]

It seems to me that it is probably not necessary for you to recreate each line in its original language, at the same time (for the same user). Chances are that most people won't speak (and read) all the languages that are being used.