Adding ja, credits to @miekof

i18n/ja.toml

@@ -0,0 +1,26 @@
+[Search-placeholder]
+other = "検索..."
+
+[Clear-History]
+other = "履歴削除"
+
+[Attachments-label]
+other = "添付"
+
+[title-404]
+other = "エラー"
+
+[message-404]
+other = "おっと。ページが見当たりません。 ¯\\_(ツ)_/¯."
+
+[Go-to-homepage]
+other = "ホームページへ行く"
+
+[Edit-this-page]
+other = "このページを編集"
+
+[Shortcuts-Title]
+other = "更に"
+
+[Expand-title]
+other = "開く..."