Don't add openGraph 'locale' to language field
Don't add openGraph 'locale' to language field

'locale' values were not valid language codes
and were causing errors in on-wiki citaiton
templates accordingly. Set 'locale' to null
instead of 'language'.

Bug: T93337
Change-Id: I5e9e03ab42f41f576c0feab28d0f8ffc074e415f

wikimedia/citoid,wikimedia/citoid,wikimedia/citoid