Solved: Translate Magento e-mail Total, Subtotal Inc.Tax etc
OK. I was struggling a lot with this one (facepalm, Magento). Needed to translate on Magento invoice e-mail the Grand Total, Subtotal fields and went through all the files that seemed logical. Came up with this, again, that in case of Magento, you will encounter some surprises in terms of its logic.
Here's how to translate those "grand total" fields in Magento (tested on 1.6.2):
Open file: \app\locale\your_language\Mage_Rss.csv
Find the strings:
Grand total - line 21
Subtotal - line 46
Enter your translations respectively in this file and you are all set. Your invoice E-mail will have these fields translated.