Backport 'Fix admin language selector' to v0.28 #7457

Job	Run time
Build test application / Build app	3m 51s
Tests (bundle exec parallel_test --type rspec --pattern spec/system --exclude-pattern spec/system... / Test app	14m 29s
Tests (bundle exec parallel_test --type rspec --pattern spec/system/admin) / Test app	11m 37s
Tests (bundle exec parallel_test --type rspec --pattern spec/ --exclude-pattern spec/system) / Test app	8m 48s
	38m 45s

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