There are extra mnemonic chars on control buttons below.

- "(O)" for Open button
- "(S)" for Save button
- "(C)" for Cancel button

They should be removed from the message text because these buttons
don't have the function corresponding to the mnemonics.

We should remove the mnemonic char from each resource according to
the English behavior.

src/share/classes/com/sun/swing/internal/plaf/basic/resources/basic_ko.properties
src/share/classes/com/sun/swing/internal/plaf/basic/resources/basic_zh_CN.properties
src/share/classes/com/sun/swing/internal/plaf/basic/resources/basic_zh_TW.properties
FileChooser.cancelButtonText
FileChooser.saveButtonText
FileChooser.openButtonText