added MQTT monitor type

src/languages/en.js

@@ -306,4 +306,9 @@ export default {
     "One record": "One record",
     steamApiKeyDescription: "For monitoring a Steam Game Server you need a Steam Web-API key. You can register your API key here: ",
     "Current User": "Current User",
+    topic: "Topic",
+    topicExplanation: "MQTT topic to monitor",
+    successMessage: "Success Message",
+    successMessageExplanation: "MQTT message that will be considered as success",
+    url: "Server URL",
 };