Translate blueimp errors

Error messages are not translated while using the Blueimp uploader - Please note that I haven't tried the other ones. 

I believe this was originally done in https://github.com/1up-lab/OneupUploaderBundle/commit/9c9a403eba5b8e4fa73a76ab5c33fd63d4297d9b, but has been lost along the way. 

At first, I made a custom error handler to handle this, and then I considered it could be useful to everyone and should be in the original bundle. 

Please let me know if you need anything else.