You need to make a define in a language file. Steps to do that :
1. Make a new file in includes/languages/english/extra-definitions and call it something like my_definitions.php . The file should look something like :
2. Make a new file in includes/languages/dutch/extra-definitions and call it the same thing . The file should look something like :
define('MY_NEW_DEFINE', 'Text to appear on page in English');
So far you have defined a constant called 'MY_NEW_DEFINE' that will be one thing in english and will be another thing in dutch.
define('MY_NEW_DEFINE', 'Text to appear on page in Dutch');
3. Now you need to used that in one of the templates. If you are trying to put it on the product_info page you will probably want to edit includes/templates/YOURTEMPLATE/templates/tpl_product_info_display.php. Depends a bit where you actually want to out the text. In that file you need to add the following code:
That's it .
Actually there are a few subtleties ( like making override versions of the first two files ) but the above should work.