In some language, mnemonics put after label text within parentheses.
e.g. "&Open" is translated to "開く(&O)" in Japanese.
OS X doesn't use mnemonics and '&' in label text is removed.
Mnemonics in parentheses (and spaces before them) also should be removed.
Change-Id: I88c0a1f60af7e148b3cf24a4e215ce807d62bce3
Reviewed-by: Tasuku Suzuki <stasuku@gmail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
8e3aacf61b