Add localizations

public/locales/en/common.json

@@ -54,9 +54,6 @@
     },
     "remove": "Remove from grid"
   },
-  "errors": {
-    "unauthorized": "You don't have permission to perform that action"
-  },
   "filters": {
     "labels": {
       "element": "Element",
@@ -94,6 +91,18 @@
       "light": "Light"
     }
   },
+  "errors": {
+    "internal_server_error": {
+      "title": "Internal Server Error",
+      "description": "The server reported a problem that we couldn't automatically recover from. Please try your request again."
+    },
+    "not_found": {
+      "title": "Not found",
+      "description": "The page you're looking for couldn't be found",
+      "button": "Create a new party"
+    },
+    "unauthorized": "You don't have permission to perform that action"
+  },
   "proficiencies": {
     "sabre": "Sabre",
     "dagger": "Dagger",

public/locales/ja/common.json

@@ -63,6 +63,15 @@
     }
   },
   "errors": {
+    "internal_server_error": {
+      "title": "サーバーエラー",
+      "description": "サーバーから届いたエラーは自動的に復されなかったため、再びリクエストを行なってください"
+    },
+    "not_found": {
+      "title": "見つかりませんでした",
+      "description": "探しているページは見つかりませんでした",
+      "button": "新しい編成を作成"
+    },
     "unauthorized": "行ったアクションを実行する権限がありません"
   },
   "header": {