Merged in feat/SW-2782-create-sas-branded-header (pull request #2878)

feat(SW-2782): Updated header as per design, added language switcher and user menu

* feat(SW-2782): Updated header as per design, added language switcher and user menu

* feat(SW-2782): Updated UI as per design

* feat(SW-2782): Optimised code with use of Popover and modal from RAC


Approved-by: Anton Gunnarsson

apps/partner-sas/components/Menu/utils.ts

@@ -0,0 +1,6 @@
+export function getInitials(firstName: string, lastName: string) {
+  if (!firstName || !lastName) return null
+  const firstInitial = firstName.charAt(0).toUpperCase()
+  const lastInitial = lastName.charAt(0).toUpperCase()
+  return `${firstInitial}${lastInitial}`
+}