@kayexelate
It loooks a bit more complicated to edit language files for a nüvi 1260. Either wait for official files from Garmin (it they will ever come) or try some structured XML editor to assist the editing in a better way than a text editor.
Free Microsoft XML Notepad 2007:
Code:http://www.microsoft.com/downloads/en/details.aspx?familyid=72d6aa49-787d-4118-ba5f-4f30fe913628&displaylang=en