l10n: add australium localization

src/strings/ja.js

@@ -11,8 +11,8 @@ module.exports = {
 	// Price strings
 	"Data unavailable": "データがありません", // sourced from AppleGlot
 	"%@ ref": "%@精錬メタル",
-	"%@ key": "%@ key",
-	"%@ keys": "%@ keys",
+	"%@ key": "%@個の鍵",
+	"%@ keys": "%@個の鍵",
 
 	// Item quality names, all sourced from TF2 wiki
 	"Normal": "ノーマル",
@@ -21,5 +21,6 @@ module.exports = {
 	"Unique": "専用",
 	"Strange": "ストレンジ",
 	"Collector's": "Collector's",
-	"Haunted": "Haunted"
+	"Haunted": "Haunted",
+	"Australium": "オーストラリウム"
 }