Japanese idol names are inconsistent

[estragon0]

Mini idol objects include a japanese_name attribute. For Muse members, this name includes a space (U+0020) between the family and given names; for all Aquors members except Dia, it is instead a full-width space (U+3000); for Dia and all others, there is no space. These should be made consistent, ideally with no space in any of them to match the standard Japanese rendering.