feat: add Japanese Translation (#260)

Author: EvernightFedora

package/metadata.json

@@ -20,6 +20,8 @@
         "Id": "luisbocanegra.smart.video.wallpaper.reborn",
         "License": "GPLv2+",
         "Name": "Smart Video Wallpaper Reborn",
+        "Name[zh_CN]": "智能视频壁纸",
+        "Name[ja]": "スマートビデオ壁紙",
         "Version": "2.12.0",
         "Website": "https://github.com/luisbocanegra/plasma-smart-video-wallpaper-reborn"
     },