Backport 'Fix admin language selector' to v0.28 #17619

Job	Run time
Build test application / Build app	3m 45s
Tests (bundle exec parallel_test --type rspec --pattern spec/system --exclude-pattern spec/system... / Test app	13m 54s
Tests (bundle exec parallel_test --type rspec --pattern spec/system/admin) / Test app	12m 30s
Tests (bundle exec parallel_test --type rspec --pattern spec/ --exclude-pattern spec/system) / Test app	7m 0s
	37m 9s

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