Doris Tam authored Jun 26, 2019 and Robert Lyon committed Jul 19, 2019

'Preferred language' is the language they set in their account settings.

It does not mean that text that is written in a different language is
translated automatically. Only Mahara provided language strings are
of concern here.

Note: Preferred language can be changed if user changes language via
the language switcher before logging in

behatnotneeded

Change-Id: I9eebd522bfc222c0dbfa87c5ca5217f4a50d402b