Here is a great article on how to use TranslatedStrings.Txt to customizing the File Structure in Adobe Lightroom
http://digital-photography-howto.com/translatedstrings-txt-explained-customizing-the-file-structure-in-adobe-lightroom/
NOTE : If you copy and paste the example text show on his page, make sure to change the quotes (“), when I pasted the string into Notepad and saved the file, it looked OK.
But it didn’t work until I’d retyped the ” at the start and end of the line.