Add clear unfavorited history functionality. Close #372

assets/translation.json

@@ -391,7 +391,8 @@
     "Click to select an image": "点击选择一张图片",
     "Source URL": "源地址",
     "The URL should point to a 'index.json' file": "该URL应指向一个'index.json'文件",
-    "Double tap to zoom": "双击缩放"
+    "Double tap to zoom": "双击缩放",
+    "Clear Unfavorited": "清除未收藏"
   },
   "zh_TW": {
     "Home": "首頁",
@@ -785,6 +786,7 @@
     "Click to select an image": "點擊選擇一張圖片",
     "Source URL": "源地址",
     "The URL should point to a 'index.json' file": "該URL應指向一個'index.json'文件",
-    "Double tap to zoom": "雙擊縮放"
+    "Double tap to zoom": "雙擊縮放",
+    "Clear Unfavorited": "清除未收藏"
   }
-}
+}