<Swing Dev> [9] Review request for 8080628: No mnemonics on Open and Save buttons in JFileChooser

[Alexey Ivanov]

Hello Swing team,

Could you please review the fix:
     bug: https://bugs.openjdk.java.net/browse/JDK-8080628
     webrev: http://cr.openjdk.java.net/~aivanov/8080628/jdk9/webrev.00/

Description:
Since Open and Save buttons in JFileChooser are default ones, mnemonics 
are redundant on these buttons.

There's no mnemonic on Open and Save buttons in Metal Look-and-Feel but 
it's displayed on Open button when a directory is selected in the file 
list. This is inconsistent.

The fix:
Remove mnemonics in JFileChooser from basic.properties which is used as 
the base for translation updates.
Remove separate JFileChooser keys from metal.properties since they're 
the same as in basic.properties now.

The test:
Regression test checks Open, Save, and Cancel buttons in JFileChooser 
have no mnemonics in all the supported localizations in Metal and Nimbus 
look-and-feels.

Thanks,
Alexey