Yes i did it using a notepad that's since i respected the lenght of the single words. Was not possible for me adding more spaces, removing more spaces, changing the words lenght. I tried to do that removing a space for a new character, but it doesnt work it crashes and u gotta reflash back the N900 couse the binary (camera ui) is loaded during the bootup of the OS. there was not way to be next respecting the lenght and the characters. This is why some things wrote in the general settings and translated, are a little bit "different" but u gotta keep the sense..
No, that is not how ISO works. Any camera without manual exposure controls will automatically adjust exposure time or aperture so that the images will look just as bright, no matter what ISO is used.