[EN] Support 'etydate' template

[lasconic]

• Wiktionary page: https://en.wiktionary.org/wiki/cinnabar

Wikicode:

{{etydate|mid-15th century}}

Output:

Etydate

Expected:

First attested in the mid-15th century

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Model link, if any: https://en.wiktionary.org/wiki/Template:etydate