Appdata related issues
<developer_name translatable="no">Manuel Genovés, Wolf V.</developer_name>
<developer id="gnome.org">
<name translatable="no">Manuel Genovés</name>
<name translatable="no">Wolf Vollprecht</name>
</developer>
Translatable developer names
It seems I was wrong about untranslatable developer and application names.
If you think these areas should be translatable you can remove translatable=no tags.
Developer ID
Appstream decided to use reverse DNS for developer IDs.
The element should have a id property, containing a unique ID to identify the component developer / development team. It is recommended to use a reverse-DNS name, like org.gnome or io.github.ximion, or a Fediverse handle (like @user@example.org) as ID to achieve a higher chance of uniqueness.
More information: https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-developer
Developer name
A developer element must have one name tag as child, which contains a translatable name for the component developer or development team. Values might be for example "The GNOME Foundation" or "The KDE Community".
Sorry for my mistakes.