uiconfirm no longer duplicates its own backdrop/frame/text/menu drawing
- it now just opens the shared uimodal_t with a Confirm/Cancel option
pair and translates the result back to a bool. uimodal itself gains an
optional title (NULL skips the title row entirely) so a title-less
confirm dialog doesn't reserve blank space.
Main menu's Quit option now opens a confirm dialog instead of exiting
immediately.
Drops es_MX.po/jp_JP.po locale files.
Co-Authored-By: Claude Sonnet 5 <[email protected]>