[chrome-gnome-shell/feature/network-errors] Provide better error message when network error occured.

[Yuri Konotopov <ykonotopov src gnome org>]

commit 6d72ff8c0677e548b1a81726f8208cb1b4a94e13
Author: Yuri Konotopov <ykonotopov gmail com>
Date:   Tue Apr 19 18:52:59 2016 +0300

    Provide better error message when network error occured.
    
    https://github.com/nE0sIghT/chrome-gnome-shell-mirror/issues/2

 extension/_locales/en/messages.json |    3 +++
 extension/_locales/ru/messages.json |    3 +++
 extension/include/update.js         |    5 +++++
 3 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/extension/_locales/en/messages.json b/extension/_locales/en/messages.json
index 9f2bb96..d173bc1 100644
--- a/extension/_locales/en/messages.json
+++ b/extension/_locales/en/messages.json
@@ -21,6 +21,9 @@
                        }
                }
        },
+       "network_error": {
+               "message": "A network error has occured. Please check your Internet connection and/or proxy 
settings."
+       },
        "no_host_response": {
                "message": "No host response"
        },
diff --git a/extension/_locales/ru/messages.json b/extension/_locales/ru/messages.json
index e4d8b0b..fda27cb 100644
--- a/extension/_locales/ru/messages.json
+++ b/extension/_locales/ru/messages.json
@@ -21,6 +21,9 @@
                        }
                }
        },
+       "network_error": {
+               "message": "Произошла сетевая ошибка. Пожалуйста, проверьте ваше подключение к Интернет и/или 
настройки прокси сервера."
+       },
        "no_host_response": {
                "message": "Нет ответа от хост-коннектора"
        },
diff --git a/extension/include/update.js b/extension/include/update.js
index 51c374b..deea3a2 100644
--- a/extension/include/update.js
+++ b/extension/include/update.js
@@ -84,6 +84,11 @@ GSC.update = (function($) {
                                                                lastUpdateCheck: new Date().toLocaleString()
                                                        });
                                                }).fail(function (jqXHR, textStatus, errorThrown) {
+                                                       if(textStatus === 'error' && !errorThrown)
+                                                       {
+                                                               textStatus = m('network_error');
+                                                       }
+
                                                        createUpdateFailedNotification(textStatus);
                                                });
                                        }