Fix remaining German log messages: Panel registered, Listener active, sync all files to PROJECTS

- Fix sed $-anchor issue: 'Panel registriert' now replaced globally
- Translate: Listener aktiv, Select-Handler, Closing-Hook, Doppelklick-Handler
- Translate SPLASH messages: gesetzt/angewendet
- Translate ALIAS-LOADER, WELCOME, ELEMENTE migration messages
- Full rsync of all rhino/*.py to PROJECTS (previously partial sync missed schnitte.py, wand_grips.py, treppe_grips.py, text_editor.py, welcome.py etc.)

rhino/_inspect_obj_section.py

@@ -76,7 +76,7 @@ else:
             print("  err:", ex)
 
     if css is None:
-        print("  None (kein Custom-SectionStyle gesetzt)")
+        print("  None (kein Custom-SectionStyle set)")
     else:
         print("  Type:", type(css).__name__)
         print("")