From [[Recai]]:
> Here is my initial work on ikiwiki l10n infrastructure (I'm sending it
> before finalizing, there may be errors).

I've revised the patches (tested OK):

- $config{lang} patch:

    http://people.debian.org/~roktas/patches/ikiwiki/ikiwiki-lang.diff

  + Support for CGI::FormBuilder.
  + Modify Makefile.PL for l10n.

- l10n infrastructure from Koha project.  (This patch must be applied with
  '-p1', also, it needs a 'chmod +x l10n/*.pl' after patching.)

  + Leave templates dir untouched, use a temporary translations directory
    instead.
  + Fix Makefile (it failed to update templates).

    http://people.debian.org/~roktas/patches/ikiwiki/ikiwiki-l10n.diff

However...

> There are two places in IkiWiki, subject to localization: HTML::Template

Unfortunately this is not correct.  There a few (?) exceptional places, for
example button texts in CGI.pm:

    my @buttons=("Save Page", "Preview", "Cancel");

> fine.  Also a final note, I haven't examined the quality of generated
> templates yet.

Looks like, tmpl_process3 cannot preserve line breaks in template files.
For example, it processed the following template:

    Someone[1], possibly you, requested that you be emailed the password for
user
    <TMPL_VAR USER_NAME> on <TMPL_VAR WIKINAME>[2].

    The password is: <TMPL_VAR USER_PASSWORD>

    --
    ikiwiki

    [1] The user requesting the password was at IP address <TMPL_VAR
REMOTE_ADDR>
    [2] Located at <TMPL_VAR WIKIURL>

as (in Turkish):

Birisi[1], ki muhtemelen bu sizsiniz, <TMPL_VAR WIKINAME>[2] üzerindeki
<TMPL_VAR USER_NAME> kullanıcısına ait parolanın epostalanması isteğinde
bulundu. Parola: <TMPL_VAR USER_PASSWORD> -- ikiwiki [1] Parolayı isteyen
kullanıcının ait IP adresi: <TMPL_VAR REMOTE_ADDR>[2] <TMPL_VAR WIKIURL>

----

> Unfortunately this is not correct.  There a few (?) exceptional places, for
> example button texts in CGI.pm:
>
>     my @buttons=("Save Page", "Preview", "Cancel");

Hmm, I've thought on this issue.  Using Locale::gettext seems to be the
natural solution.  But this would need to create another po file and also,
ikiwiki would depend another Perl module.  Kinda overkill...

I have another idea...  What about to create another (flat) template file
for this sort of strings?  Something like strings.tmpl with the content:

    Save Page, Preview, Cancel

or we could categorize these strings in some variables (',' is the
delimiter for this code snippet):

    <TMPL_IF NAME="BUTTONS">
    Save Page, Preview, Cancel
    </TMPL_IF>

and then (preferably in a separate wrapper function in CGI.pm):

     my $template=template("strings.tmpl");
     $template->param("BUTTONS", 1);
     my @buttons=split(/\s*,\s*/, $template->output);

You get the idea...  I've tried this method.  All in one po file, kind of
ugly, but it _really_ works.

> > fine.  Also a final note, I haven't examined the quality of generated
> > templates yet.
>
> Looks like, tmpl_process3 cannot preserve line breaks in template files.
> For example, it processed the following template:

This could be easily worked around in tmpl_process3, but I wouldn't like to
maintain a separate utility.