Issue #3274899 by AdamPS: Set account/langcode from recipient

...er_bc/src/Plugin/EmailBuilder/ContactEmailBuilderBase.php

...er_bc/src/Plugin/EmailBuilder/ContactPageEmailBuilder.php

.../Plugin/EmailBuilder/SimplenewsNewsletterEmailBuilder.php

..._mailer_bc/src/Plugin/EmailBuilder/UpdateEmailBuilder.php

...ny_mailer_bc/src/Plugin/EmailBuilder/UserEmailBuilder.php

modules/symfony_mailer_bc/symfony_mailer_bc.module

src/Email.php

src/EmailInterface.php

src/Mailer.php

src/Plugin/EmailAdjuster/ToEmailAdjuster.php