Add translation key for time ago (#4813)

Co-authored-by: Cyril59310 <archas.cyril@hotmail.fr>

src/lang/en.json

@@ -49,10 +49,13 @@
     "Uptime": "Uptime",
     "Cert Exp.": "Cert Exp.",
     "Monitor": "Monitor | Monitors",
+    "now": "now",
+    "time ago": "{0} ago",
     "day": "day | days",
     "-day": "-day",
     "hour": "hour",
     "-hour": "-hour",
+    "-year": "-year",
     "Response": "Response",
     "Ping": "Ping",
     "Monitor Type": "Monitor Type",
@@ -80,7 +83,7 @@
     "resendDisabled": "Resend disabled",
     "retriesDescription": "Maximum retries before the service is marked as down and a notification is sent",
     "ignoreTLSError": "Ignore TLS/SSL errors for HTTPS websites",
-	  "ignoreTLSErrorGeneral": "Ignore TLS/SSL error for connection",
+    "ignoreTLSErrorGeneral": "Ignore TLS/SSL error for connection",
     "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.",
     "Upside Down Mode": "Upside Down Mode",