Use theme css variables

packages/language-select/src/vpu-language-select-demo.js

-import {html, LitElement} from 'lit-element';
+import {html, LitElement, css} from 'lit-element';
 import './vpu-language-select.js';
 import * as commonUtils from 'vpu-common/utils';
 

packages/language-select/src/vpu-language-select.js

@@ -81,9 +81,11 @@ class LanguageSelect extends LitElement {
 
     static get styles() {
         return css`
+            ${commonUtils.getThemeCSS()}
+
             a:hover {
-                background-color: #000;
-                color: #fff;
+                background-color: var(--vpu-dark);
+                color: var(--vpu-light);
                 transition: none;
             }
 
@@ -91,9 +93,10 @@ class LanguageSelect extends LitElement {
                 padding: 5px;
                 display: inline-block;
                 text-decoration: none;
-                color: #000;
                 transition: background-color 0.15s, color 0.15s;
                 font-weight: 300;
+                color: var(--vpu-dark);
+                border-radius: var(--vpu-border-radius);
             }
         `;
     }

common @ 8ca2d5ca

-Subproject commit 892548cb2343fd74dc4d7c49c52983602b773f13
+Subproject commit 8ca2d5cafade6c6b1c966452521ef0430c282487