RFR: 8327856: Convert applet test SpanishDiacriticsTest.java to a main program

[Phil Race]

Converts the  manual applet test in the files ..
SpanishDiacriticsTest/SpanishDiacriticsTest.html
SpanishDiacriticsTest/SpanishDiacriticsTest.java
.. to a main program using PassFailJFrame

Added requires windows since it seems very windows-specific.

I got rid of the redundant extra directory which makes the .java file "new" according to github but it is largely changed anyway

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Commit messages:
 - 8327856

Changes: https://git.openjdk.org/jdk/pull/18208/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18208&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327856
  Stats: 190 lines in 3 files changed: 93 ins; 97 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18208.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18208/head:pull/18208

PR: https://git.openjdk.org/jdk/pull/18208