fix utf-8 encoding in date-js/core.js
fix utf-8 encoding in date-js/core.js

Change-Id: I89fea8c83110fae8f0eff77909a0c8acf3507462
Reviewed-on: https://gerrit.instructure.com/15268
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>
Reviewed-by: Stanley Stuart <d3942c3cf0aa13de8a95b690bdc33eab29ac4e73@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>

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