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A change introduced in hexojs/hexo#3808,
og:locale
Open Graph tag only accepts "language_TERRITORY" format.Since "language_TERRITORY" breaks multilingual support, user should instead use "language-TERRITORY" format which is automatically transformed to "language_TERRITORY" in
open_graph()
helper.However, "language-TERRITORY" still breaks multilingual support for non-ZH users, this PR fixes that.
See official list (by Facebook; Hexo only checks the length, not the value itself) of supported locales.