I18n: translate node panel titles

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

scripts/modules/bl_i18n_utils/settings.py

@@ -277,6 +277,10 @@ PYGETTEXT_KEYWORDS = (() +
     tuple((r"{}\(\s*[^,]+,\s*" + _msg_re + r"\s*\)").format(it)
           for it in ("node_sock_label",)) +
 
+    # Node panel declarations
+    tuple((r"\.{}\(\s*" + _msg_re + r"\s*\)").format(it)
+          for it in ("add_panel",)) +
+
     # Geometry Nodes field inputs
     ((r"FieldInput\(CPPType::get<.*?>\(\),\s*" + _msg_re + r"\s*\)"),) +