TMX stands for Translation Memory eXchange. The purpose of a translation memory is to gather thousands of translations. Whenever you need a term such as Home for your website chances are it is already translated, and all you have to do is to load a TMX file to get the translations.

You can export the messages and their translations to TMX level 1 files. To do that just click the Export button.

The message catalog also supports importing TMX files. You can add new messages and translations importing a TMX file in TMX level 1. Enter the filename and click the Import button.