Add Japanese names from translated name snippets before CleverRaven#7…

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Family and given names from names/en.json are converted to translated names from the Japanese mo file before CleverRaven#70279 using a script. The translated names are then appended to lists in names/ja.json, sorted, and made unique. Translations that are not names are then removed. (They are easy to locate after sorting, because the Japanese translators translated names using half-width katakana exclusively.)