RFR: JDK-8296137: diags-examples.xml is broken

[Jonathan Gibbons]

Please review some minor updates to the `diags/examples` mechanism, repairing some bitrot after one of the not-so-recent repo reorgs.

For bonus, I've added a target for the German version of the output.

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Commit messages:
 - JDK-8296137: diags-examples.xml is broken

Changes: https://git.openjdk.org/jdk/pull/10998/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10998&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296137
  Stats: 12 lines in 2 files changed: 6 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/10998.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10998/head:pull/10998

PR: https://git.openjdk.org/jdk/pull/10998