l10n: add missing japanese strings

src/strings/ja.js

@@ -3,7 +3,7 @@ module.exports = {
 	"View listings on %@": "%@で検索結果を見る",
 
 	// Itembox header
-	"Community Pricing": "Community Pricing",
+	"Community Pricing": "共同体価格",
 	// Itembox footer
 	"Updated %@.": "アップデート: %@。", // %@ is a date string, sourced from AppleGlot
 	"Trade prices sourced from %@. Currency conversions are approximate.": "Trade prices sourced from %@. Currency conversions are approximate.", // %@ is always a URL, (eg. prices.tf)
@@ -22,5 +22,23 @@ module.exports = {
 	"Strange": "ストレンジ",
 	"Collector's": "Collector's",
 	"Haunted": "Haunted",
-	"Australium": "オーストラリウム"
+	"Australium": "オーストラリウム",
+	"Festive": "フェスティブ",
+
+	// Botkiller names, all sourced from TF2 wiki
+	"Botkiller": "ボットキラー",
+	"Silver": "シルバー",
+	"Gold": "ゴールド",
+	"Rust": "さびた",
+	"Blood": "ブラッド",
+	"Carbonado": "黒ダイヤ",
+	"Diamond": "ダイヤモンド",
+	"Silver Mk.II": "シルバー Mk.II",
+	"Gold Mk.II": "ゴールド Mk.II",
+
+	// Killstreak tiers sourced from TF2 wiki
+	"Killstreak Kit": "キルストリークキット",
+	"kt-1": "Standard",
+	"kt-2": "Specialized",
+	"kt-3": "Professional",
 }