fix(webapp): migrate deprecated `substr()` #322

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Run time

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Job	Run time
test-e2e2	6m 20s
test-e2e2	15m 59s
test-black-format	7s
test-black-format	7s
test-missing-migrations	3m 42s
test-missing-migrations	3m 42s
test-api	6m 37s
test-api	6m 37s
	43m 11s