feat: improve response content type header

public/i18n/locale-en.json

@@ -1,5 +1,6 @@
 {
   "ERRORS": {
+    "request_error": "Unable to download the file, check your connection or contact the admin.",
     "repo_not_found": "The repository is not found.",
     "repo_not_accessible": "Anonymous GitHub is unable to or is forbidden to access the repository.",
     "repository_expired": "The repository is expired",

public/script/app.js

@@ -1669,11 +1669,16 @@ angular
               $scope.type = "error";
               try {
                 err.data = JSON.parse(err.data);
-              } catch (ignore) {}
-              if (err.data.error) {
-                $scope.content = err.data.error;
-              } else {
-                $scope.content = err.data;
+                if (err.data.error) {
+                  $scope.content = err.data.error;
+                } else {
+                  $scope.content = err.data;
+                }
+              } catch (ignore) {
+                console.log(err);
+                if (err.status == -1) {
+                  $scope.content = "request_error";
+                }
               }
             }
           );