feature: finish source texts (en)

src/en/400.json

@@ -1,4 +1,4 @@
 {
   "name": "Bad Request",
-  "message": "The server cannot process the request due to a client error."
+  "message": "The server can not process the bad syntax request due to a client error."
 }

src/en/403.json

@@ -1,4 +1,4 @@
 {
   "name": "Forbidden",
-  "message": "The server understood the request but refuses to authorize it."
+  "message": "You are not allowed to access this page according to the server settings. You can also verify the address you have just tried to open."
 }

src/en/404.json

@@ -1,4 +1,4 @@
 {
   "name": "Not Found",
-  "message": "The origin server did not find a current representation for the target resource or is not willing to disclose that one exists."
+  "message": "The requested page does not exist on the server or it has been moved to another place. You can also verify the address you have just tried to open."
 }

src/en/410.json

@@ -0,0 +1,4 @@
+{
+  "name": "Gone",
+  "message": "You have just tried to request a page that previously existed, but has been permanently removed from the Internet and will no longer appear here."
+}

src/en/500.json

@@ -0,0 +1,4 @@
+{
+  "name": "Internal Server Error",
+  "message": "An unexpected error happened during process your request or it is an incorrect server configuration. Try to get this page later."
+}

src/en/502.json

@@ -0,0 +1,4 @@
+{
+  "name": "Bad Gateway",
+  "message": "The server is configured as a gateway or proxy, and it is not receiving a valid response from the backend servers that should actually fulfill yuor request. Try to get this page later."
+}

src/en/503.json

@@ -0,0 +1,4 @@
+{
+  "name": "Service Unavailable",
+  "message": "The server is overloaded or under maintenance, and can not process you request. Try to get this page later."
+}

src/en/504.json

@@ -0,0 +1,4 @@
+{
+  "name": "Gateway Timeout",
+  "message": "The server is configured as a gateway or proxy server, and it is not receiving a response from the backend servers within the allowed time period. Try to get this page later."
+}

src/en/common.json

@@ -1,7 +1,7 @@
 {
   "apology": "We are sorry for the inconvenience.",
   "comment": "Created with Error Pages",
-  "comment-aria": "Visit Error Pages repository",
+  "comment-aria": "Visit Error Pages repository on GitHub",
   "go-back": "Go back",
-  "go-back-aria": "Return to previous page"
+  "go-back-aria": "Go back to a previous page"
 }