Capitalize login button

client/components/Header/HeaderRightMenu.js

@@ -30,7 +30,7 @@ const HeaderMenu = props => {
   const login = !props.auth.isAuthenticated && (
     <HeaderMenuItem>
       <a href="/login" title="login / signup" onClick={goTo}>
-        <Button>Login / sign up</Button>
+        <Button>Login / Sign up</Button>
       </a>
     </HeaderMenuItem>
   );

client/components/NeedToLogin/NeedToLogin.js

@@ -78,7 +78,7 @@ const NeedToLogin = () => (
       </Title>
       <Link href="/login" prefetch>
         <a href="/login" title="login / signup">
-          <Button>Login / sign up</Button>
+          <Button>Login / Sign up</Button>
         </a>
       </Link>
     </TitleWrapper>