Internationalization: move guide to en folder and preserve its history. (#494)

* chore: move guide to en folder

* docs: add english as language

docs/guide/src/en/describing_ui/component_children.md

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+# Component Children
+
+In some cases, you may wish to create a component that acts as a container for some other content, without the component needing to know what that content is. To achieve this, create a prop of type `Element`:
+
+```rust
+{{#include ../../examples/component_element_props.rs:Clickable}}
+```
+
+Then, when rendering the component, you can pass in the output of `cx.render(rsx!(...))`:
+
+```rust
+{{#include ../../examples/component_element_props.rs:Clickable_usage}}
+```
+
+> Note: Since `Element<'a>` is a borrowed prop, there will be no memoization.
+
+> Warning: While it may compile, do not include the same `Element` more than once in the RSX. The resulting behavior is unspecified.
+
+## The `children` field
+
+Rather than passing the RSX through a regular prop, you may wish to accept children similarly to how elements can have children. The "magic" `children` prop lets you achieve this:
+
+```rust
+{{#include ../../examples/component_children.rs:Clickable}}
+```
+
+This makes using the component much simpler: simply put the RSX inside the `{}` brackets – and there is no need for a `render` call or another macro!
+
+```rust
+{{#include ../../examples/component_children.rs:Clickable_usage}}
+```