improve network error route (#1435)

src/i18n/locales/en.json

@@ -119,6 +119,7 @@
         "quit": "quit",
         "random": "random",
         "rating": "rating",
+        "retry": "retry",
         "recordLabel": "record label",
         "releaseType": "release type",
         "refresh": "refresh",
@@ -212,6 +213,8 @@
         "mpvRequired": "MPV required",
         "multipleServerSaveQueueError": "the play queue has one or more songs which are not from the current server. this is not supported",
         "networkError": "a network error occurred",
+        "noNetwork": "server unavailable",
+        "noNetworkDescription": "couldn't connect to this server",
         "notificationDenied": "permissions for notifications were denied. this setting has no effect",
         "openError": "could not open file",
         "playbackError": "an error occurred when trying to play the media",