Update EN language (#2429)

* Update EN language

src/languages/en.js

@@ -609,16 +609,16 @@ export default {
     goAlert: "GoAlert",
     backupOutdatedWarning: "Deprecated: Since a lot of features added and this backup feature is a bit unmaintained, it cannot generate or restore a complete backup.",
     backupRecommend: "Please backup the volume or the data folder (./data/) directly instead.",
-    "Optional": "Optional",
+    Optional: "Optional",
     squadcast: "Squadcast",
     SendKey: "SendKey",
     "SMSManager API Docs": "SMSManager API Docs ",
     "Gateway Type": "Gateway Type",
     SMSManager: "SMSManager",
     "You can divide numbers with": "You can divide numbers with",
-    "or": "or",
+    or: "or",
     recurringInterval: "Interval",
-    "Recurring": "Recurring",
+    Recurring: "Recurring",
     strategyManual: "Active/Inactive Manually",
     warningTimezone: "It is using the server's timezone",
     weekdayShortMon: "Mon",
@@ -647,7 +647,26 @@ export default {
     statusPageMaintenanceEndDate: "End",
     IconUrl: "Icon URL",
     "Enable DNS Cache": "Enable DNS Cache",
-    "Enable": "Enable",
-    "Disable": "Disable",
+    Enable: "Enable",
+    Disable: "Disable",
     dnsCacheDescription: "It may be not working in some IPv6 environments, disable it if you encounter any issues.",
+    "Single Maintenance Window": "Single Maintenance Window",
+    "Maintenance Time Window of a Day": "Maintenance Time Window of a Day",
+    "Effective Date Range": "Effective Date Range",
+    "Schedule Maintenance": "Schedule Maintenance",
+    "Date and Time": "Date and Time",
+    "DateTime Range": "DateTime Range",
+    Strategy: "Strategy",
+    "Free Mobile User Identifier": "Free Mobile User Identifier",
+    "Free Mobile API Key": "Free Mobile API Key",
+    "Enable TLS": "Enable TLS",
+    "Proto Service Name": "Proto Service Name",
+    "Proto Method": "Proto Method",
+    "Proto Content": "Proto Content",
+    Economy: "Economy",
+    Lowcost: "Lowcost",
+    high: "high",
+    "General Monitor Type": "General Monitor Type",
+    "Passive Monitor Type": "Passive Monitor Type",
+    "Specific Monitor Type": "Specific Monitor Type",
 };