Meta dialog messages were left in experimental mode

The messages 'visualeditor-dialogbutton-meta-tooltip' and 'visualeditor
-dialog-meta-title' were left in the experimental block rather than
production, so didn't appear in live. My fault, sorry.

Change-Id: I4d2f8d9ee0900d1d3ee635f348f2cc1491287f3d
Merge "Meta dialog messages were left in experimental mode"