Display correct message when trying to enter value greater than limit

[CarolineDenis]

Fixes #2970

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone

Testing instructions

• Open form (i.e new locality)
• Enter required field
• Enter 9999999999999999 in max uncertainty
• Save
• See that save is blocked
• Verify there is an error message on max uncertainty saying: 'Value must be less or equal to 9007199254740991'

NOTES:
The issue is due to a JavaScript number precision limitation.
The maximum safe integer that can be accurately represented is 9007199254740991.
If you enter a number like 9999999999999999, JavaScript rounds it to the nearest representable value, which is 10000000000000000, due to precision loss.

[emenslin]

• Verify there is an error message on max uncertainty saying: 'Value must be less or equal to 9007199254740991'

Looks good

[combs-a]

• Verify there is an error message on max uncertainty saying: 'Value must be less or equal to 9007199254740991'

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Error appeared properly, looks good.