Language files should be encoded in UTF-8 (without BOM).

A lang pack should partially reproduce the fp directory structure, so that the contents of the decompressed archive can be safely dropped into the flatpress installation dir

Here's a sample coming from the en-us package which is bundled in Flatpress 0.804.1 Vivace (you can use the shell script on this page; a php script should be coming soon):

.
|-- fp-interface
|   `-- lang
|       `-- en-us
|           |-- id
|           |-- lang.admin.config.php
|           |-- lang.admin.entry.php
|           |-- lang.admin.main.php
|           |-- lang.admin.maintain.php
|           |-- lang.admin.php
|           |-- lang.admin.plugin.php
|           |-- lang.admin.static.php
|           |-- lang.admin.themes.php
|           |-- lang.admin.uploader.php
|           |-- lang.admin.widgets.php
|           |-- lang.comments.php
|           |-- lang.conf.php
|           |-- lang.contact.php
|           `-- lang.default.php
|-- fp-plugins
|   |-- accessibleantispam
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- adminarea
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- akismet
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- archives
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- blockparser
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- calendar
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- categories
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- lastcomments
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- lastentries
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- lightbox
|   |   `-- lang
|   |       `-- lang.en-us.php
|   |-- prettyurls
|   |   `-- lang
|   |       `-- lang.en-us.php
|   `-- thumb
|       `-- lang
|           `-- lang.en-us.php
`-- fp-setup
    `-- lang
        `-- lang.en-us.php

Usage: ./makelangpack LOCALE

where 'LOCALE' is the locale id of the target language (it-it, en-us, de-de… etc)

put this script in the same dir where you have flatpress/

this script will create a lang/ dir with all of the language files; the script will attempt to create a fp-lang-$LOCALE.tar.bz2 file, you can anyway zip or tar the lang/ dir on your own.

PS: I know, this code sucks :D ~~NWM

#!/bin/sh
 
ROOT=`pwd`
CURRENT=$ROOT/flatpress
LANG=$1
DEST=$ROOT/lang
 
if [ -z $LANG ]; then 
        echo USAGE: makelangpack LANG
        echo Where LANG is a locale, as in en-us, it-it, de-de etc.
fi
 
rm -Rf $DEST
mkdir -p $DEST/fp-interface/lang 
 
echo COPYING MAIN LANG FILES
cp -Rf $CURRENT/fp-interface/lang/$LANG/ $DEST/fp-interface/lang/
echo DONE
 
mkdir $DEST/fp-plugins/
echo COPYING PLUGIN LANG FILES
for A in $CURRENT/fp-plugins/* ; do
        if [ -e $A/lang/ ] ; then
                THEFILE=`basename $A`
                echo  $THEFILE : COPYING LANG FILE
                THEDIR=$DEST/fp-plugins/$THEFILE/lang/
                mkdir -p $THEDIR
                cp $CURRENT/fp-plugins/$THEFILE/lang/lang.$LANG.php $THEDIR
        fi
done
echo
 
echo CREATING PACKAGE
 
tar cjf fp-lang-$LANG.tar.bz2 $DEST
 
echo LANG files for $LANG are in $DEST

this Batch file creates a LANGPACK directory, you'll have to zip it yourself :)

@echo off
 
setlocal ENABLEDELAYEDEXPANSION
 
set ROOT=%CD%
set CURRENT=%CD%\flatpress
set LANG=%1
set DEST=%ROOT%\LANGPACK
 
if "%LANG%"=="" GOTO USAGE
if not exist %CURRENT%\index.php GOTO USAGE
 
rmdir /s /q %DEST% > NUL
mkdir %DEST%\fp-interface\lang > NUL
 
echo COPYING MAIN LANG FILES
mkdir %DEST%\fp-interface\lang\%LANG% > NUL
copy %CURRENT%\fp-interface\lang\%LANG%\ %DEST%\fp-interface\lang\%LANG% > NUL
echo DONE
 
mkdir %DEST%\fp-plugins\
echo COPYING PLUGIN LANG FILES
for /d %%A in (%CURRENT%\fp-plugins\*) do (
	if exist %%A (
		set THEFILE=%%~nxA
		echo !THEFILE!
		set THEDIR=%DEST%\fp-plugins\!THEFILE!\lang\
		mkdir !THEDIR! > NUL
		copy %CURRENT%\fp-plugins\!THEFILE!\lang\lang.%LANG%.php !THEDIR! > NUL
	)
)
echo DONE
 
GOTO EOF

 
:USAGE
echo USAGE: makelangpack LANG
echo Where LANG is a locale, as in en-us, it-it, de-de, etc.

:EOF