Displaying a question mark in RTL is not as easy as it sounds, because different languages use different question marks.
Languages which use Arabic or Arabic-style script flip the question mark, resulting in ؟. On the other hand, Hebrew does not flip the question mark; they use the LTR-style ?.
This is normally handled as part of string localization, but you have to be careful if you have a question mark embedded into a bitmap, such as a Help icon or button. You have to make the bitmap available to localization so that the Arabic localizers can flip the question mark, whereas the Hebrew localizers leave it alone.