How to escape a % in magento translation

Question

Inside Mage_Core.csv have the following line

"Please input a valid CSS-length. For example 100px or 77pt or 20em or .5ex or 50%."

The problem is, Magento expect this % to be a parameter, and gives me the error

"vsprintf(): Too few arguments"

How can i ignore this '%' ?

Answer 1

For a literal percent character, use %%

Reference: Magento uses vsprintf to format translations https://secure.php.net/vsprintf