extract string can update existing po file

util/run_xgettext.sh

@@ -2,9 +2,16 @@
 
 cd $(dirname $0)
 
+OPTS=
+
+if [ -e "$1" ]
+then
+	OPTS="-j -o $1"
+fi
+
 KEYWORDS="-k -kt -ktt:1,2"
- 
-find .. -name "*.php" | xargs xgettext $KEYWORDS --from-code=UTF-8
+
+find .. -name "*.php" | xargs xgettext $KEYWORDS $OPTS --from-code=UTF-8
 
 F9KVERSION=$(sed -n "s/.*'FRIENDIKA_VERSION'.*'\([0-9.]*\)'.*/\1/p" ../boot.php);