Switch from EmojiOne to Twemoji, different emoji picker (#5046)

* Switch from EmojiOne to Twemoji, different emoji picker

* Make emoji-mart use a local spritesheet

* Fix emojify test

* yarn manage:translations

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

@@ -67,13 +67,17 @@
   "embed.instructions": "要内嵌此嘟文，请将以下代码贴进你的网站。",
   "embed.preview": "到时大概长这样：",
   "emoji_button.activity": "活动",
+  "emoji_button.custom": "Custom",
   "emoji_button.flags": "旗帜",
   "emoji_button.food": "食物和饮料",
   "emoji_button.label": "加入表情符号",
   "emoji_button.nature": "自然",
+  "emoji_button.not_found": "No emojos!! (╯°□°）╯︵ ┻━┻",
   "emoji_button.objects": "物体",
   "emoji_button.people": "人物",
+  "emoji_button.recent": "Frequently used",
   "emoji_button.search": "搜索…",
+  "emoji_button.search_results": "Search results",
   "emoji_button.symbols": "符号",
   "emoji_button.travel": "旅途和地点",
   "empty_column.community": "本站时间轴暂时未有内容，快嘟几个来抢头香啊！",