first, you should replace all of the files with ones from here except for the config.php file.
if you have any attachments or avatars or other custom images be sure to backup those folders first.
then, when editing the language files, you have to be very careful.
for instance, if you wanted to edit this line in common.php language file;
'ACCOUNT_ALREADY_ACTIVATED' => 'Your account has already been activated.',
you have to leave the apostrophes as they are and only edit the text between them. if you include an apostrophe in the text, you have
to put a \ before it.
'ACCOUNT_ALREADY_ACTIVATED' => 'We don\'t care.',
and remember to leave the comma at the end if it has one.
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OK, so what's the speed of dark?