Magento – Magento translations

Magento have multiple translation scopes: Global, admin, theme & module. Depending on which block type (model) each template is defined by, the scope differs.

I'll would try adding your translation strings to your theme at: /app/design/frontend/yourpackage/yourtheme/locale/en_US/translate.csv

But it's better to know your scope, check which module/class $this is an instance of in each template, if it's not already defined in the template top comment block. Then you can add the translation strings to each modules own translation files or create them if they does not already exist.

I use Fooman PDF customiser on projects where I need to edit the PDF. Works very well for me.

Also I'd like to suggest moving all your inline translations to a translation file. Keeping translations in one place makes it more manageable.