International weekday names

[mrbrown8]

WIP: adding internationalized weekday selections in preferences_face

The idea I have about this is that, inside preferences_face, when a user selects current_page == 7, the particular language blinks, indicating that it is changeable, while the weekday name changes, but does not blink, as the user cycles through the different choices.

My C-fu is not that strong, so I welcome feedback. I'm struggling on how to get watch_utility_get_weekday() to see movement_state without it being declared extern. I'm also struggling to get const put in the right places. TIA