(Bug 50055) Bug fix in escapeTplArgWT - wrong Comment constructor name

* Comment constructor in switch statement was called Comment
  instead of CommentTk which caused the bug.
* TODO: Add more parser tests.

Change-Id: I0af5889e7bccd0f659df9d4aa1feba9d977d1871
Merge "(Bug 50055) Bug fix in escapeTplArgWT - wrong Comment constructor name"