feat(i18n): add missing zh-CN translations (#283)

locales/zh-CN.json

@@ -134,6 +134,19 @@
     "posts": "帖文",
     "posts_with_replies": "帖文与留言"
   },
+  "time_ago_options": {
+    "in": "在",
+    "just_now": "刚刚",
+    "last_month": "上个月",
+    "last_week": "上周",
+    "last_year": "去年",
+    "next_month": "下个月",
+    "next_week": "下周",
+    "next_year": "明年",
+    "tomorrow": "明天",
+    "week": "周",
+    "yesterday": "昨天"
+  },
   "timeline": {
     "show_new_items": "展示 {0} 条新帖文"
   },