Add English translations for entity and config-flow strings

Custom integrations read translations/en.json rather than strings.json, so
without this the entity names fall back to their translation keys.

CHANGELOG.md

@@ -23,3 +23,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   count, open order delivery date, and shopping window.
 - Parser tests covering totals, contents, the locked/open distinction, money
   parsing, and year rollover on undated cart tabs.
+- English translations under `translations/en.json`, which is where custom
+  integrations read entity and config-flow strings from.

custom_components/freshharvest/translations/en.json

@@ -0,0 +1,29 @@
+{
+  "config": {
+    "step": {
+      "user": {
+        "description": "Sign in with your freshharvest.com account.",
+        "data": {
+          "email": "Email",
+          "password": "Password"
+        }
+      }
+    },
+    "error": {
+      "cannot_connect": "Failed to connect",
+      "invalid_auth": "Invalid authentication"
+    },
+    "abort": {
+      "already_configured": "This account is already configured"
+    }
+  },
+  "entity": {
+    "sensor": {
+      "next_delivery": { "name": "Next delivery" },
+      "next_delivery_total": { "name": "Next delivery total" },
+      "next_delivery_items": { "name": "Next delivery items" },
+      "open_order_delivery": { "name": "Open order delivery" },
+      "shop_window": { "name": "Shopping window" }
+    }
+  }
+}