fixing issue with deleting videos from special videos page

This fixes this p3 https://wikia.fogbugz.com/default.asp?105223 where clicking on the trash icons would not do anything. 

I've also added a generic oasis error message that gets loaded into JS on every page.  I added it because I've found myself wanting this sort of thing often for cases when you really don't expect something to go wrong, but if it does, the user at least gets a message about it.  Since it's so generic it would be nice to have only one so translators don't have to tranlate the same message multiple times.  @lgarczewski, could you please have a look and let me know your thoughts on this?

Also fixed the typo in LightboxLoader.js.