Suppress "Refresh failed" alert message for debug mode toggle

Brion pointed out there's no urgent reason to show the "Refresh failed" message at all when toggling debug mode, whereas on the My Uploads page it's actually informative as it tells you one reason why you may not be seeing images.

So makes sense to just suppress the message if it's triggered by the toggle.
Observer bug causing crash when selecting image from gallery

Oddly, MyUploadsViewController's viewWillDisappear seems to be called without a matching viewDidAppear when an image is picked from the gallery. This seems to be an iOS thing (I think?) as the gallery selection code is baked-in. This causes a problem as the observer is added in the viewDidAppear and cannot be removed unless it was added or you'll get an exception.
Localisation updates from http://translatewiki.net.
Small tweaks
Details page sharing support

There is a sharing button at the bottom center of the details page. If your device has FB or twit credentials you will see icons for them when share is pressed. Additionally, icons for "mail", "message", "contacts", "save to camera roll", "print", and "copy" may be chosen.
Merge pull request #60 from montehurd/doubleRefresh

Suppress "Refresh failed" alert message for debug mode toggle
Merge pull request #62 from montehurd/observerBugTwo

Observer bug causing crash when selecting image from gallery
Merge pull request #64 from montehurd/detailsPageShare

Details page sharing support
Merge pull request #63 from montehurd/refactor

Small tweaks