I am trying to customize emails and having a couple of problems:

1) My updates to email_extras.php are not shown in test emails

I copied \includes\languages\englishemail_extras.php into \includes\languages\english\theme277 (theme277 is my template)

I then edited disclaimer text and uploaded but when I sent a test message the original disclaimer notice was displayed.

So then I removed the file from my template and edited the original file: \includes\languages\english\email_extras.php but again when I uploaded and sent a test message the disclaimer text was still unchanged.

I only changed text in one line and I'm certain no code was damaged. What am I doing wrong?

2) I would also like to centre align all of my email templates. I set css style for .holder to align=center, but this just centres the text where I would like the whole email content to be centre aligned.