HPCC-9334 Graph view shows odd characters

Add meta type with content charset of UTF-8 for Internet Explorer.

Signed-off-by: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Merge branch 'HPCC-9334' into candidate-4.0.0

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>