新增 "鼠标滚轮翻页"

Add 'Mouse wheel page'

app/src/main/res/values/strings.xml

@@ -196,6 +196,7 @@
     <string name="img_cover">Cover</string>
     <string name="book">Book</string>
     <string name="volume_key_page">Volume keys to turn page</string>
+    <string name="mouse_wheel_page">Mouse wheel to turn page</string>
     <string name="click_turn_page">Tap screen to turn page</string>
     <string name="page_anim">Flip animation</string>
     <string name="book_page_anim">Flip animation (book)</string>