gallery update

add "tag panel", not complete

vendor/built_in_modules/gallery/config/locales/en.yml

@@ -1,6 +1,7 @@
 en:
   gallery:
     album_name: Album Name
+    album_tag: Album Tag
     all: All
     select_category: "--Select a category--"
     manage_categories: Manage Categories

vendor/built_in_modules/gallery/config/locales/zh_tw.yml

@@ -1,6 +1,7 @@
 zh_tw:
   gallery:
     album_name: 相簿名稱
+    album_tag: 相簿標籤
     all: 全部
     select_category: 選擇類別
     manage_categories: 類別管理