Nodes recently gained the ability to group inputs into collapsible
panels. These were untranslated, so this commit:
- Adds the appropriate regex to extract node panels defined with
the `add_panel()` callback.
- Adds the `IFACE()` translation macro to the drawing code for the
nodes, as well as the properties.
Pull Request: https://projects.blender.org/blender/blender/pulls/112968
b05db089af