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1. Easy_install i18ndude (probably as root or with sudo):

 easy_install i18ndude

2. Go to the locales directory of your product and (re-)generate POT file:

 i18ndude rebuild-pot --pot ${PRODUCT}.pot --create ${PRODUCT} ../

3. Synchronize the german PO file with the POT:

 i18ndude sync --pot ${PRODUCT}.pot de/LC_MESSAGES/${PRODUCT}.po

Or you can just use the following shell script to make your life easier (sh sync.sh). Replace "${DOMAIN}" with your domain and the language code with the ones you need.

#!/bin/sh

# List of languages
LANGUAGES="de fr"
DOMAIN="${DOMAIN}"
EXTRA=""

# Create locales folder structure for languages
for lang in $LANGUAGES; do
	install -d $lang/LC_MESSAGES
done

echo "Extracting pot file"
i18ndude rebuild-pot --pot $DOMAIN.pot --create $DOMAIN $EXTRA ../

# Compile po files
for lang in $(find . -mindepth 1 -maxdepth 1 -type d); do

    if test -d $lang/LC_MESSAGES; then

		PO=$lang/LC_MESSAGES/$DOMAIN.po

    	# Create po file if not exists
    	touch $PO 

		# Sync po file
		echo "Syncing $PO"
		i18ndude sync --pot $DOMAIN.pot $PO
    fi
done