minor symfony#52148 [Validator] Add missing Finnish translations (minna-xD)

This PR was merged into the 5.4 branch.

Discussion
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[Validator] Add missing Finnish translations

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes (specifically, updated translation)
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix symfony#51940
| License       | MIT

Added missing translations (translation units 104-109) and updated translation units with new singular/plural number format. Improved or fixed the translation in some translation units. There's still room for improvement (with consistency) but I didn't want to make too many changes.

Commits
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3896d01 [Validator] Add missing Finnish translations

Author: fabpot