feat: adding Greek language to the bookmarklet generator on documentation website

Author: ffoodd

docs/Hologram/test-assets/_header.html

@@ -83,6 +83,7 @@
                   <option value="pt-br" lang="pt-br">Português</option>
                   <option value="ru" lang="ru">русский</option>
                   <option value="zh" lang="zh">中文</option>
+                  <option value="gr" lang="gr">ελληνικά</option>
                 </select>
               </p>
             </fieldset>