FTP class improvements

 - Make changedir()'s first parameter mandatory (optional doesn't make sense)
 - Fix a few typos (langfile included)
diff --git a/system/language/english/ftp_lang.php b/system/language/english/ftp_lang.php
index ae4086f..042ab55 100644
--- a/system/language/english/ftp_lang.php
+++ b/system/language/english/ftp_lang.php
@@ -26,18 +26,18 @@
  */
 defined('BASEPATH') OR exit('No direct script access allowed');
 
-$lang['ftp_no_connection']			= 'Unable to locate a valid connection ID. Please make sure you are connected before peforming any file routines.';
+$lang['ftp_no_connection']		= 'Unable to locate a valid connection ID. Please make sure you are connected before peforming any file routines.';
 $lang['ftp_unable_to_connect']		= 'Unable to connect to your FTP server using the supplied hostname.';
 $lang['ftp_unable_to_login']		= 'Unable to login to your FTP server. Please check your username and password.';
-$lang['ftp_unable_to_makdir']		= 'Unable to create the directory you have specified.';
+$lang['ftp_unable_to_mkdir']		= 'Unable to create the directory you have specified.';
 $lang['ftp_unable_to_changedir']	= 'Unable to change directories.';
-$lang['ftp_unable_to_chmod']		= 'Unable to set file permissions. Please check your path. Note: This feature is only available in PHP 5 or higher.';
+$lang['ftp_unable_to_chmod']		= 'Unable to set file permissions. Please check your path.';
 $lang['ftp_unable_to_upload']		= 'Unable to upload the specified file. Please check your path.';
 $lang['ftp_unable_to_download']		= 'Unable to download the specified file. Please check your path.';
-$lang['ftp_no_source_file']			= 'Unable to locate the source file. Please check your path.';
+$lang['ftp_no_source_file']		= 'Unable to locate the source file. Please check your path.';
 $lang['ftp_unable_to_rename']		= 'Unable to rename the file.';
 $lang['ftp_unable_to_delete']		= 'Unable to delete the file.';
-$lang['ftp_unable_to_move']			= 'Unable to move the file. Please make sure the destination directory exists.';
+$lang['ftp_unable_to_move']		= 'Unable to move the file. Please make sure the destination directory exists.';
 
 /* End of file ftp_lang.php */
 /* Location: ./system/language/english/ftp_lang.php */
\ No newline at end of file