[openstreetmap-website] Implemented diary submit label changing depending on if new or editing (#903)

[fad4470]

It is a small thing, but it's good practice to make a difference clear. Though not wanting those kinds of conditionals is fair too.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/903#issuecomment-75415044
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