Enable MediaViewer survey on Spanish Wikipedia

Related MediaViewer change:
If44279fff1aad3fb68a01d167ef5cce69dbb3b34

Change-Id: Ibd1a4b14faa11fd764fe078880355d7184b698bf
Enable MediaViewer survey on Dutch Wikipedia

Related MediaViewer change:
I5f939f98f8654c3fd90bcfae1b28fec262da8332

Change-Id: Ic5892e29c6e64d0d015e8b6037c402c42ea1c7d5
Merge "Enable MediaViewer survey on Spanish Wikipedia"
Merge "Enable MediaViewer survey on Dutch Wikipedia"