to answer your questions that i actually know the answers:
the sign with a picture of picture menus on the exterior is to visualize menus with pictures for people who cannot read well, as well if someone is mute. braille is available as a courtisy, and braille is not solely used by completely blind people, as people with severe sight problems use it as well.

the atm has braille for two reasons: 1) for when its dark and you might not be able to make out the numbers, the one with raises on it is the 5 or enter.
2) for people with sight problems not as bad as pure blindness.