* Fix use of sy-langu in object serializers
- Replace sy-langu variable with mv_language
- Replace sy-langu type with langu (makes it easier to spot sy-langu)
- Enhance generic serializer to use mv_language
- Add unit tests to generic serializer
- Adjust and simplify serializers that are based on generic class
Closes#2080
* Update scvi+ueno
* Revert scvi
* Langu
* Langu
* Langu
* Langu
* Langu
Co-authored-by: Lars Hvam <larshp@hotmail.com>