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Further document Thanks gender (both en and qqq), and fix bug

Description

Further document Thanks gender (both en and qqq), and fix bug

thanks-thank was using plain, but this did not get caught because
the en value did not have a no-op example GENDER. I've added
these to all of them, for both $1 and $2. This also tells translators
they're both available.

Bug: T96527
Change-Id: I5130bbd60fe3c1c8051729758c2f2f4bea2b2030