This page allows you to edit text that might be used by a specific addon, on a per language basis.
A few things to note about editing addon text:
There will be a different section for every language you have defined on your site.
Once you change a particular text field, you can change it back to the default text by clicking on the Reset to Default link.
Once you have made the changes needed, at the bottom of the page click the Save Text Changes button.