1.) Setup your dialogs
2.) Click Export in the upper right of the menubar
3.) Give the export file a name like en_US (language_country) or what ever you prefer
4.) This will create a .csv file you can open in table document editor like Open Office
5.) Translate your texts
6.) Click Import in the upper right of the menubar and select the file
7.) Now you can switch between languages in the dropdown in the upper right
8.) Additional changes you can do in the node editor