Node.js It is an open source execution environment for developing web applications. It is an environment in which you can run a program written in JavaScript.

What is it for?
Node.js lights in real-time web applications employing push technology over web sockets. Node.js allows having web applications with real-time, two-way connections, where both, the client and server can initiate communication, allowing them free data exchange. It can handle many concurrent connections at a time. It is built on Chrome’s V8 JavaScript engine and uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js now plays a critical role in the technology stack of many high-profile companies who depend on its unique benefits.
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Contribution Specifications

Node.js is currently being translated into 33 languages and I am contributing to translate it into Spanish. 56% of the whole the project has been translated.

So far I have translated:

This time I finished translating TLS.md file and translated using-internal-errors.md

What is internal/errors.js?

The intent of the module is to allow errors provided by Node.js to be assigned a permanent identifier. Without a permanent identifier, userland code may need to inspect error messages to distinguish one error from another. An unfortunate result of that practice is that changes to error messages result in broken code in the ecosystem. For that reason, Node.js has considered error message changes to be breaking changes. By providing a permanent identifier for a specific error, we reduce the need for userland code to inspect error messages.
In simple words it means that every error has got a unique code assigned.
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Few examples of some strings that mention the value of:

ENGLISH: <0>Note</0>: Switching an existing error to use the <1>internal/errors</1> module must be
considered a <1>semver-major</1> change.

SPANISH: <0> Nota </0>: Cambiar un error existente para usar el módulo <1> internal/ errors </1> debe
considerarse un cambio <1> semver-major </1>.

ENGLISH: Using internal/errors.js
SPANISH: Usar internal/errors.js

ENGLISH:The <0>internal/errors</0> module exposes three custom <0>Error</0> classes that are intended to replace existing <0>Error</0> objects within the Node.js source.
SPANISH:El módulo <0>internal/errors</0> expone tres clases personalizadas <0>Error</0> que están destinadas a reemplazar los objetos existentes <0>Error</0> dentro de la fuente de Node.js.

This time I learnet two new concepts:

Message Inspectors

A message inspector is an extensibility object that can be used in the service model's client runtime and dispatch runtime programmatically or through configuration and that can inspect and alter messages after they are received or before they are sent.
Client message inspectors implement the IClientMessageInspector interface and service message inspectors implement the IDispatchMessageInspector interface. The implementations can be combined into a single class to form a message inspector that works for both sides.

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Ecosystem in IT
Although this concept is normally associated with biological systems, ecosystem is also used in technology. IT ecosystem is "the network of organizations that drive the creation and delivery of information technology products and services."

These ecosystems offer solutions comprising a larger system of use than the original platform owner created and solve important technical problems within an industry.
In successful technology ecosystems it is easy to connect to or build upon the core solution in order to expand the system of use and allow new and even unanticipated end uses.
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