Update en.js

Fixed spelling error

src/languages/en.js

@@ -5,7 +5,7 @@ export default {
     "Avg.": "Avg. ",
     retriesDescription: "Maximum retries before the service is marked as down and a notification is sent",
     retryIntervalInactive: "Inactive",
-    retryIntervalDescription: "If retries are and used this value is greater then zero this interval will be used instead.",
+    retryIntervalDescription: "If retries are used and this value is greater then zero this interval will be used instead.",
     ignoreTLSError: "Ignore TLS/SSL error for HTTPS websites",
     upsideDownModeDescription: "Flip the status upside down. If the service is reachable, it is DOWN.",
     maxRedirectDescription: "Maximum number of redirects to follow. Set to 0 to disable redirects.",