changing the title option names and adding a new option

How do I exactly change the title option names? I tried changing the title names but they still have the same names. I am exactly talking about this piece of code:

Scene_Title.prototype.createCommandWindow = function() { this._commandWindow = new Window_TitleCommand(); this._commandWindow.setHandler('newGame', this.commandNewGame.bind(this)); this._commandWindow.setHandler('continue', this.commandContinue.bind(this)); this._commandWindow.setHandler('options', this.commandOptions.bind(this)); this.addWindow(this._commandWindow);};How do I exactly change the names?

And how can I add my own method / option? I don't understand the concept of TextManager, getter, etc.

can someone please enlighten me?

no need fot that you can change it into the term tabs "new game" :)

It seems you are missing my point :/

I want to change it via scripting, it comes useful later, when I wanted to specify sprite names with the same title name.

I'm quite new to RPG Maker scrpting & Javascript but I've trying to dig around the core files, for a few hours trying to do something similarish (play around with Menus) (Adding a new Command to the Battle Menu (got the menu option text so far.. now workng on getting a subsequent sub-window). I'm currently stuck on trying to identify the command selected from the battle menu (but that's another story).

From what I could gather, a lot of the pre-existing windows rely on values from TextManager, try looking for that.

However you may also be able to use nio kasagami's suggestion to track the change , making the through RPG Maker's GUI. Save as a separate project with no other changes and use some software to compare the differences i.e. Winmerge. To see what RPG Maker MV updated.

Hope this helps, and isn't a complete red herring :|