You should have made a backup before playing with nand.

A general approach to save your system would be:

Make a backup now.

Mount your latest known to work backup you made and diff/restore/fix the files concerning locales.

If you dont have ever made a backup since 2013
you can try to use "The Lazy Approach"
https://wiki.maemo.org/Updating_the_firmware as a reference.

Maybe make a backup after you fixed it again