Magento 1.9 change email totals

[SilentAce]

Hello Members,

I want to customize the invoice email send to the customers, more specifically the totals section.  I have couple of questions about this.
Where are the invoice files for the email located?
How can i modify the files? Any links would be useful. 
I also need to translate some of the words like Grand Total (inkl. tax) and Tax. Which .csv files control this?

Thanks

[MrKhoa99 · Accepted solution]

Hello,

You can find template email here: app/locale/en_US/template/email/sales

I use rwd package as current package

Layout for email:app/design/frontend/rwd/default/layout/sales.xml => lines 270 ~ 330

Templates render: app/design/frontend/rwd/default/template/email

For translation Tax:

app/locale/en_US/Mage_Tax.csv

You should read more here: http://www.demacmedia.com/magento-commerce/how-to-create-custom-email-templates-in-magento/

PS: You should post at Core Technology - Magento 1.x