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/__unused/attribute_spreading.md

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+In the cases where you need to pass arbitrary element properties into a component – say to add more functionality to the `<a>` tag, Dioxus will accept any quoted fields. This is similar to adding arbitrary fields to regular elements using quotes.
+
+```rust
+
+rsx!(
+    Clickable {
+        "class": "blue-button",
+        "style": "background: red;"
+    }
+)
+
+```
+
+For a component to accept these attributes, you must add an `attributes` field to your component's properties. We can use the spread syntax to add these attributes to whatever nodes are in our component.
+
+```rust
+#[derive(Props)]
+struct ClickableProps<'a> {
+    attributes: Attributes<'a>
+}
+
+fn clickable(cx: Scope<ClickableProps<'a>>) -> Element {
+    cx.render(rsx!(
+        a {
+            ..cx.props.attributes,
+            "Any link, anywhere"
+        }
+    ))
+}