Hm, is it not possible to add the language (german) to the small build?
The standard edition (without the opt) is much larger than the small edition. And i need only the language.
You can extract the usr.sqfs of the small and the standard edition. Use 'unsquashfs', you can use -d for the destination directory name.
Replace the the usr/lib/locale/locale-archive file in the small edition with the one from the standard edition.
Compress the the usr directory for the small edition (mksquashfs).
Replace the original usr.sqfs with your new created usr.sqfs.
Do you need help on any step?
Best regards
Elmar