New review topic form should be titled "Create New Review" not "Create New Topic"

[netweb]

Following the new topic message for reviews in [3996], the topic form should be titled "Create New Review" rather than "Create New Topic"

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[SergeyBiryukov]

ticket:2012:meta-2012.patch​ introduces a wporg_support_is_single_review() function that could be used here.

Nevermind, it's not a singular page :)

[SergeyBiryukov]

In 4748:

Support Theme: For reviews, change "Create a new topic" heading to "Create a new review".

Props netweb.
Fixes #2010.

[SergeyBiryukov]

In 4938:

Support Forums: For reviews, change "Topic Title" and "Topic Tags" labels to "Review Title" and "Review Tags", respectively.

See #2010.