FE: timestamp fix #1826

front/php/templates/language/en_us.json

@@ -240,7 +240,7 @@
     "Device_TableHead_CustomProps": "Props / Actions",
     "Device_TableHead_FQDN": "FQDN",
     "Device_TableHead_Favorite": "Favorite",
-    "Device_TableHead_FirstSession": "First Session",
+    "Device_TableHead_FirstSession": "First Seen",
     "Device_TableHead_Flapping": "Flapping",
     "Device_TableHead_GUID": "GUID",
     "Device_TableHead_Group": "Group",
@@ -249,7 +249,7 @@
     "Device_TableHead_Icon": "Icon",
     "Device_TableHead_LastIP": "Last IP",
     "Device_TableHead_LastIPOrder": "Last IP Order",
-    "Device_TableHead_LastSession": "Last Offline",
+    "Device_TableHead_LastSession": "Last Seen",
     "Device_TableHead_Location": "Location",
     "Device_TableHead_MAC": "Random MAC",
     "Device_TableHead_MAC_full": "Full MAC",