For those having problems translating the wp e-commerce plugin on the special characters on the Store page. Once i save a tab all looks normal but once i click on another tab and return the special characters problems return. I had this exactly same problem with Wp E-commerce Plugin and finally manage to solve in a very simple way. My problem was on the Store tabs (on all)
Go to /wp-content/plugins/wp-e-commerce/wpsc-admin/includes/settings-pages/
Open all 09 php files (taxes.php, shipping.php, presentation.php, marketing.php, import.php, general.php, checkout.php, admin.php)
On the line right after header (‘Content-type: text/html; charset=utf-8′);
And all the pages i added it are working perfect now. In my case, my site was working everywhere except on those pages so this simple solution solved my problem. If you are experiencing problems in the whole site, then first check the following steps first:
1. Go to your wp-config.php file in your wordpress root folder.
Add define(‘WPLANG’, ‘pt_BR’); where instead of pt_Br, you will add the right one for your language/code.
2. Go to /wp-content/plugins/wp-e-commerce/wpsc-languages/
Add your translated pot and mo file.
3. On your admin panel, go to Settings/General and check your encoding: Encoding for pages and feeds
Hope this info will help someone having this issue cause it took me a long time to solve it.