Replace "register" with "create"

[alecrem]

Close #33

• Change "register" filename/URL to "create"
• Update l18n strings to say "create" instead of "register"
• Change l18n variable names from "register" to "create"

[vercel[bot]]

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Name	Status	Preview	Updated
henkaku-nengajo-frontend	✅ Ready (Inspect)	Visit Preview	Dec 10, 2022 at 0:59AM (UTC)