Minor UI improvements

src/Dashboard.js

@@ -31,7 +31,7 @@ class Dashboard extends React.Component {
                         </Col>
                         <Col xs={{ offset: 0 }} md={{ offset: 1 }}>
                             <br />
-                            <Button variant="success" href="/purchase">Compra</Button>
+                            <Button variant="success" href="/purchase">Comprar</Button>
                         </Col>
                     </Row>
                     <TransactionList />

src/Head.js

@@ -23,8 +23,8 @@ function Head(props) {
             <Navbar.Toggle aria-controls="basic-navbar-nav" />
             <Navbar.Collapse id="basic-navbar-nav">
                 <Nav className="mr-auto">
-                    <Nav.Link href="/">Dashboard</Nav.Link>
                     <Nav.Link href="/products">Productos</Nav.Link>
+                    <Nav.Link href="/purchase">Comprar</Nav.Link>
                 </Nav>
                 {adminNav}
                 <Form inline>