"Delete" is being used almost everywhere in OpenStack Dashboard
except the instance panel. Using "Delete" looks more consistent.
In addition, "Delete" tells non-native English speakers that
deleted instances will be no longer usable again compared to
"Terminate".
DocImpact
Closes-Bug: #1502773
Change-Id: Idccaf3c45566f20f11d02ada64c1d3934a6f3002
5fc26b0a11