Add translation file & base

locales/en-US/about.json

@@ -0,0 +1,3 @@
+{
+    
+}

locales/en-US/index.json

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+{
+    "welcome": "This page is under development.",
+    "instead_1": "For now, please visit ",
+    "instead_2": " ."
+}

locales/ja-JP/about.json

@@ -0,0 +1,3 @@
+{
+    
+}

locales/ja-JP/index.json

@@ -0,0 +1,5 @@
+{
+    "welcome": "このページは現在工事中です。",
+    "instead_1": "今のところは、",
+    "instead_2": "を閲覧してください。"
+}