In the /bin/debug folder of my solution I\'ve noticed a slew of what appear to be foreign language folders with names like \"ar\", \"bg\", \"ca\", \"cs\", \
I have the exact same problem and I've managed to narrow it down. The problem lies with these two references:
By removing these two references, I've managed to remove the unnecessary foreign language DLLs.
If you cant afford to remove those 2 references or any other references, you can delete the foreign language dlls from silverlight installation directory eg. C:\Program Files (x86)\Microsoft SDKs\Silverlight\v5.0\Libraries\Client