Fix English Translation Strings

We recently added some strings to translations, but forgot to add them
to the translation file. This adds them so they're not missing from the
prod website at https://confessit.app.

#57

public/locales/en/translation.json

@@ -423,5 +423,17 @@
       "text_past": "I allowed myself to be controlled by anger.",
       "detail": ""
     }
+  },
+  "addbutton": {
+    "add-custom-sin": "Add custom sin",
+    "i-sinned-by": "I sinned by…",
+    "cancel": "Cancel",
+    "add": "Add"
+  },
+  "examineitem": {
+    "yes": "Yes"
+  },
+  "priestbubble": {
+    "priest": "Priest"
   }
 }