add buttons that communicate with the browser extension (Athou/commafeed-browser-extension#1)

commafeed-client/src/locales/zh/messages.po

@@ -308,6 +308,11 @@ msgstr "展开"
 msgid "Export your subscriptions and categories as an OPML file that can be imported in other feed reading services"
 msgstr "将您的订阅和类别导出为 OPML 文件，可以在其他提要阅读服务中导入"
 
+#: src/components/header/Header.tsx
+#: src/pages/WelcomePage.tsx
+msgid "Extension options"
+msgstr ""
+
 #: src/components/content/add/Subscribe.tsx
 msgid "Feed name"
 msgstr "提要名称"
@@ -540,6 +545,10 @@ msgstr "最早的优先"
 msgid "Oops!"
 msgstr "哎呀！"
 
+#: src/components/header/Header.tsx
+msgid "Open CommaFeed"
+msgstr ""
+
 #: src/components/KeyboardShortcutsHelp.tsx
 msgid "Open current entry in a new tab"
 msgstr "在新选项卡中打开当前条目"
@@ -759,10 +768,12 @@ msgid "Swipe header to the right"
 msgstr ""
 
 #: src/components/header/ProfileMenu.tsx
+#: src/pages/WelcomePage.tsx
 msgid "Switch to dark theme"
 msgstr "切换到深色主题"
 
 #: src/components/header/ProfileMenu.tsx
+#: src/pages/WelcomePage.tsx
 msgid "Switch to light theme"
 msgstr "切换到浅色主题"