Kaabi

#!/bin/sh
[ -z $1 ] && echo "Language file name is missing" && exit 1
[ -z $2 ] && echo "Language variable name is missing" && exit 1
[ -z "$3" ] && echo "Language variable value is missing" && exit 1

for i in $(find . -maxdepth 1 -mindepth 1 -type d); do
  if ! [ -z "$(tail -c 1 "$i/$1_lang.php")" ]; then
    echo "\n" >>$i/$1_lang.php
  fi
  echo "\$lang['"$2"'] = '"$3"';" >>$i/$1_lang.php