refactor: make format_dialog_content method public, use it in the extensions menu

Signed-off-by: Dominik Willner <th33xitus@gmail.com>

kiauh/extensions/gcode_shell_cmd/metadata.json

@@ -4,6 +4,6 @@
     "module": "gcode_shell_cmd_extension",
     "maintained_by": "dw-0",
     "display_name": "G-Code Shell Command",
-    "description": "Allows to run a shell command from gcode."
+    "description": ["Run a shell commands from gcode."]
   }
 }