I've been trying to translate my entire site, and so far it is good. My only problem is that I cannot translate the "Only X left" text on my product page. How can I change this? Thanks Sebastian
How is this being printed in your template? For a string to be translatable it needs to be passed through the translate function which is $this->__() within a block. This way you can use your translation csv files to match the string and replace it.
In your case it is slightly more complex as there is dynamic content. Have a look at app/design/frontend/base/default/template/cataloginventory/stockqty/default.phtml.
echo $this->__('Only %s left', ($this->getStockQty()))
You will see that the X value is a %s and the second parameter to the translate function is the stock count, the %s will be replaced with the stock count at page render.
So in your translation file you should be able to replace the original string, e.g
'Only %s left', 'There are %s products left'
For example see app/locale/fr_FR/Mage_CatalogInventory.csv line 31