Menu: Ensure an event was passed before checking its type. Fixes #9384 - Menu: _focus function forgets null check with doing a pattern match on event.type
(cherry picked from commit 670f650b99103bcea779f8ad0428e05cb7e37053)
Datepicker i18n: Removed "<" in the "Anterior" text for the pt locale.

Removed "<" in the "Anterior" text, so that it is consistent with "Seguinte".
(cherry picked from commit e591a7a9af123862fbef9d55c54351f6f995b7a7)