Translate LayoutHeader Component (reactjs#89)

* Translate LayoutHeader Component

* docs: Translate comment

Author: Alexandre Lara

src/components/LayoutHeader/DocSearch.js

@@ -17,8 +17,8 @@ class DocSearch extends Component<{}, State> {
     enabled: true,
   };
   componentDidMount() {
-    // Initialize Algolia search.
-    // TODO Is this expensive? Should it be deferred until a user is about to search?
+    // Inicializar a busca do Algolia.
+    // TODO Isto é custoso? Deveria ser adiado até que um usuário esteja prestes a pesquisar?
     // eslint-disable-next-line no-undef
     if (window.docsearch) {
       window.docsearch({
@@ -27,7 +27,7 @@ class DocSearch extends Component<{}, State> {
         inputSelector: '#algolia-doc-search',
       });
     } else {
-      console.warn('Search has failed to load and now is being disabled');
+      console.warn('A busca falhou ao ser carregada e está sendo desativada');
       this.setState({enabled: false});
     }
   }
@@ -104,8 +104,8 @@ class DocSearch extends Component<{}, State> {
           }}
           id="algolia-doc-search"
           type="search"
-          placeholder="Search docs"
-          aria-label="Search docs"
+          placeholder="Buscar docs"
+          aria-label="Buscar docs"
         />
       </form>
     ) : null;

src/components/LayoutHeader/Header.js

@@ -75,7 +75,7 @@ const Header = ({location}: {location: Location}) => (
                 marginTop: 1,
               },
               [media.lessThan('small')]: {
-                // Visually hidden
+                // Visualmente escondido
                 position: 'absolute',
                 overflow: 'hidden',
                 clip: 'rect(0 0 0 0)',
@@ -125,7 +125,7 @@ const Header = ({location}: {location: Location}) => (
           />
           <HeaderLink
             isActive={location.pathname.includes('/community/')}
-            title="Community"
+            title="Comunidade"
             to="/community/support.html"
           />
           <HeaderLink

src/components/LayoutHeader/SearchSvg.js

@@ -8,11 +8,11 @@ import React from 'react';
 
 const SearchSvg = () => (
   <svg
-    alt="Search"
+    alt="Busca"
     height="16"
     xmlns="http://www.w3.org/2000/svg"
     viewBox="0 0 16 16">
-    <title>Search</title>
+    <title>Busca</title>
     <path
       d={`
         M6.02945,10.20327a4.17382,4.17382,0,1,1,4.17382-4.17382A4.15609,4.15609,