add buttons to message tiles

src/translations.ts

@@ -33,6 +33,8 @@ const englishTranslations = {
   encryptionUnavailableTitle: "Encryption is not available",
   encryptionUnavailableMessage:
     "Obtain this app via HTTPS or continue without encryption",
+
+  decryptMessage: "Decrypt message",
   copyMessage: "Copy message",
   deleteMessage: "Delete message",
 };