message: fix(config): replace the empty sting
diff: @@ -217,8 +217,8 @@ export function appConfigFactory (): AppConfig {
  contextMenus: {
  selected: ['oxford', 'google_translate', 'merriam_webster', 'cambridge', 'google_search', 'google_page_translate', 'youdao_page_translate'],
  all: {
  - google_page_translate: '',
  - youdao_page_translate: '',
  + google_page_translate: 'x',
  + youdao_page_translate: 'x',
  google_search: 'https://www.google.com/#newwindow=1&q=%s',
  baidu_search: 'https://www.baidu.com/s?ie=utf-8&wd=%s',
  bing_search: 'https://www.bing.com/search?q=%s',
  