With my normal session (that has es_ES.UTF-8):

$ br --profile seleniumchrome --suite default --name 'Viewing the status for multiple lessons in multiple courses'
en_AU.UTF-8

Command: vendor/bin/behat --config /Users/stronk7/Sites/moodle_data_gitintegration/master/mysql_behat/behatrun/behat/behat.yml  --profile seleniumchrome --suite default --name 'Viewing the status for multiple lessons in multiple courses'

en_AU.UTF-8
Moodle 3.8dev (Build: 20190628), f33fd11ef27b4ddb5eb3fbbbc327dd93d9309996
Php: 7.2.19, mysqli: 5.6.44, OS: Darwin 18.6.0 x86_64
Server OS "Darwin", Browser: "chrome"
Browser specific fixes have been applied. See http://docs.moodle.org/dev/Acceptance_testing#Browser_specific_fixes
Started at 03-07-2019, 18:31
........F---------------------------------------

--- Pasos fallidos:

001 Scenario: Viewing the status for multiple lessons in multiple courses # /Users/stronk7/git_moodle/integration/mod/lesson/tests/behat/lesson_student_dashboard.feature:294
      And the following "activities" exist:                               # /Users/stronk7/git_moodle/integration/mod/lesson/tests/behat/lesson_student_dashboard.feature:302
        Error writing to database (dml_write_exception)

1 escenario (1 fallaron)
48 pasos (8 pasaron, 1 fallaron, 39 saltadas)
0m6,39s (78,27Mb)




Forcing LANG=C:

stronk7@~/git_moodle/integration (master *%>)$ LANG=C br --profile seleniumchrome --suite default --name 'Viewing the status for multiple lessons in multiple courses'
en_AU.UTF-8

Command: vendor/bin/behat --config /Users/stronk7/Sites/moodle_data_gitintegration/master/mysql_behat/behatrun/behat/behat.yml  --profile seleniumchrome --suite default --name 'Viewing the status for multiple lessons in multiple courses'

en_AU.UTF-8
Moodle 3.8dev (Build: 20190628), f33fd11ef27b4ddb5eb3fbbbc327dd93d9309996
Php: 7.2.19, mysqli: 5.6.44, OS: Darwin 18.6.0 x86_64
Server OS "Darwin", Browser: "chrome"
Browser specific fixes have been applied. See http://docs.moodle.org/dev/Acceptance_testing#Browser_specific_fixes
Started at 03-07-2019, 18:31
................................................

1 scenario (1 passed)
48 steps (48 passed)
0m21.89s (78.67Mb)