Add keyboard shortcuts link to getting-started navigation (#5874)

* Add keyboard shortcuts link to getting-started navigation

* i18n: 🇵🇱

* yarn manage:translations

app/javascript/mastodon/locales/zh-TW.json

@@ -7,6 +7,7 @@
   "account.followers": "專注者",
   "account.follows": "正關注",
   "account.follows_you": "關注你",
+  "account.hide_reblogs": "Hide boosts from @{name}",
   "account.media": "媒體",
   "account.mention": "提到 @{name}",
   "account.moved_to": "{name} has moved to:",
@@ -16,6 +17,7 @@
   "account.report": "檢舉 @{name}",
   "account.requested": "正在等待許可",
   "account.share": "分享 @{name} 的用者資訊",
+  "account.show_reblogs": "Show boosts from @{name}",
   "account.unblock": "取消封鎖 @{name}",
   "account.unblock_domain": "不再隱藏 {domain}",
   "account.unfollow": "取消關注",
@@ -132,6 +134,7 @@
   "navigation_bar.favourites": "最愛",
   "navigation_bar.follow_requests": "關注請求",
   "navigation_bar.info": "關於本站",
+  "navigation_bar.keyboard_shortcuts": "Keyboard shortcuts",
   "navigation_bar.logout": "登出",
   "navigation_bar.mutes": "消音的使用者",
   "navigation_bar.pins": "置頂貼文",