SUMMARY
Media Topics instaed of Subject-Codes

Select an image;
Item -> Edit metadata... opens the dialog to edit metadata
Go to tab Edit IPTC/Edit XMP  -> Subjects

Here within "Use standard reference code" we have a dropdown box with about 1400 entries like 01000000  (8 digits)
each representing an IPTC subject-code

This dropdown box is also shown with: Settings -> Configure digiKam -> Templates -> Subjects

(1)
IPTC group has decided to NOT maintain the subject-codes any more.
Instead the Media Topics should be used.
For details please see https://www.iptc.org/std/NewsCodes/guidelines/

Currently both lists are more or less identical, but they are not 100% identical
e.g.: medtop:20001131 is subjectcode:17005000

(2)
It would be very very helpful to see not only the reference, but
- this reference together with its Name, Matter and Detail
- before the user has selected an entry

After the user has selected an entry these fields are updated in "use custom definition"

(3)
IPTC maintains the MediaTopic in various languages.
So it would also be helpful to support these languages.

STEPS TO REPRODUCE
1. 
2. 
3. 

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION