The underline for shortcut in Swatches tab on ColorChooser^Vplaces at ')' in ja locale
even if it defines mnemonic char as 'S' and the localized string has mnemonic char 'S'.

basic_ja.properties:
ColorChooser.swatchesNameText=\u30b5\u30f3\u30d7\u30eb(S)
ColorChooser.swatchesMnemonic=83
ColorChooser.swatchesDisplayedMnemonicIndex=6

It seems that the number of 'ColorChooser.swatchesDisplayedMnemonicIndex' is for
displaying the underline for shortcut and it's not associated with mnemonic char
defined in 'ColorChooser.swatchesMnemonic'. I think this implementation is very
weird and the index of the location for underline does not need.