Consider to clarify "use strict" concept

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Hello

About "use strict" in https://javascript.info/strict-mode is indicated:

> This was the case until 2009 when ECMAScript 5 (ES5) appeared. It added new features to the language and modified some of the existing ones. _To keep the old code working, most such modifications are off by default. You need to explicitly enable them with a special directive: "use strict"_

The italic part is not very clear (I read the spanish version too), it gives the idea that "use strict" enables the old mode code

Of course in https://javascript.info/javascript-specials#strict-mode is more clear with:

> _To fully enable all features of **modern JavaScript**, we should start scripts with "use strict"._

Thank you

Inizia con le sezioni sulla strict mode in javascript.info/strict-mode e javascript.info/javascript-specials#strict-mode, confrontando le spiegazioni citate. Chiarisci la frase in corsivo in modo che non suggerisca che "use strict" abiliti il comportamento legacy; il lavoro è completato quando la spiegazione corrisponde alla formulazione più chiara ed elimina l’ambiguità.

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