RFR: 7903527: Improve accessibility in JT HTML reports - every HTML document should have `lang` attribute defined

Thu Aug 17 12:40:07 UTC 2023

Currently the generated HTML reports/configs etc. have <html> tag without `lang` attr.

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Commit messages:
 - 7903527: Improve accessibility in JT HTML reports - every HTML document should have `lang` attribute defined

Changes: https://git.openjdk.org/jtharness/pull/50/files
 Webrev: https://webrevs.openjdk.org/?repo=jtharness&pr=50&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903527
  Stats: 26 lines in 14 files changed: 26 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jtharness/pull/50.diff
  Fetch: git fetch https://git.openjdk.org/jtharness.git pull/50/head:pull/50

PR: https://git.openjdk.org/jtharness/pull/50