[WIP] add Cinnamon Menu Editor to Menu and System Settings by default

[TranzistorP]

Currently, the menu editor by default only opens with
'Right-click on the menu launch button - Edit menu.'

To figure out how to edit the Menu, I first spent about 20 minutes searching for this function in the Menu and System Settings. Then I googled it, but the search in Google in my language only suggested using third-party programs, and only the search in English gave a result.
I think it would be useful to add the menu editor by default to the Menu and possibly to the System Settings.

This is my first pull request and I would appreciate help and feedback.
I have a few questions:
What do I need to do to properly localize this item in the Menu?
Do I need to add it to generate_additional_files.py or somewhere else, or is the translation to .desktop done manually?
What do I need to do to properly localize this item in the System Settings?
Do I need to do the translation myself using Google Translate or are there separate people doing this?

Thank you for your attention and sorry for my English.

[fredcw]

What's your use case for needing to edit the menu? I'm wondering if there may be some menu issues that might be better fixed elsewhere?

[TranzistorP]

Сreating a shortcut is use case for needing to edit the menu .
Adding the ability to immediately select a menu category would fixed this issues.

[anaximeno]

@fredcw do you know if menu configurations work for the other (third parties) menus as well (Like Cinnamenu, and CinnVIIStarkMenu), i.e. is it a general configuration?

[TranzistorP]

As I understand it, this is a general configuration because it is regulated directly in the .desktop files.
That is, this shortcut will be visible in any menu in the graphical shell with the name X-Cinnamon.

I checked, everything works in Cinnamenu.

[anaximeno]

Oh, ok. My question is in the sense if you remove one of the menu sections (like the "Others" section) in the menu editor, will that change reflect on other menus as well (can we garantee that)? Otherwise we would have a settings module that depends on the menu applet being used.

[fredcw]

@anaximeno Yes, menu categories are in /usr/share/desktop-directories and apps are in /usr/share/applications and user defined versions of these, which override the systems ones are in ~/.local/share/desktop-directories and ~/.local/share/applications`

These files are read by cinnamon and all the menu applets query cinnamon appsystem for the menu structure.