so French.pm might look like:

package MyWebsite::French;

my %translation {

tag_color => rouge;
tag_street => rue;
tag_hooligan => anglais;
#etc
1;
}
[download]

Would you please clean up your code, this is jibberish. You have a lexical hash, which is not accessible outside of this module file; a block of which I assume it is supposed to represent an anonymous hash AKA a hash ref, your strings on the RHS of the arrows are unquoted, you separate the key/value pairs with semicolons instead of comma's, and you have a "1;" inside the hash definition instead of after it. Plus there is no "=" sign connecting the hash and the data. Well, at least your comment uses the correct delimiter. ;-)

Cleaned up:

package MyWebsite::French;

%translation  = (
  tag_color => 'rouge',
  tag_street => 'rue',
  tag_hooligan => 'anglais',
  #etc
);
1;
[download]

Now, one can have access to this hash via %MyWebsite::French::translation.

Otherwise, your suggestion to use a template module sounds good to me.