[jdk16] RFR: JDK-8247994: Localize javadoc search

[Jonathan Gibbons]

This is for JDK16, as a precursor to fixing JDK-8258002.

While it is good to be using localized strings in the generated output, the significance for JDK-8258002 is that the strings are now obtained from a resource file, and not hardcoded in JavaScript file itself.

The source file `search.js` is renamed to `search.js.template`, and (unlike other template files) is copied as-is into the generated image. The values in the template are resolved when javadoc is executed, depending on the locale in use at the time. Because of the change in the file's extension, two makefiles are updated to accommodate the new extension: one is for the "interim" javadoc used to generate the API docs; the other is for the primary javadoc in the main JDK image.

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Commit messages:
 - JDK-8247994: Localize javadoc search

Changes: https://git.openjdk.java.net/jdk16/pull/16/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=16&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247994
  Stats: 122 lines in 9 files changed: 88 ins; 6 del; 28 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/16.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/16/head:pull/16

PR: https://git.openjdk.java.net/jdk16/pull/16