Resolve "Creating labs gives 500"

This mr does three things to the lab creation page mentioned in #102 (closed)

1. The 500 error is gone by fixing a bug in the backend
2. A form field is now properly aligned with the rest
3. All validation also happens in the browser with a consistent api, rather than mixing backend / custom alerts and the browser constraint api.

See the individual commit messages for more info

This addresses some important issues from #102 (closed), but the entire story of validation is not entirely resolved. I think we should discuss our strategy regarding validation there.

changed milestone to %Queue 1.0

added priohigh + 1 deleted label

added 1 commit

• 22ae4115 - Additional lab validation

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resolved all threads

approved this merge request

merged

mentioned in commit e56b7535

mentioned in merge request !158 (merged)

mentioned in commit ef3840f9

unassigned @Lemaire