minor symfony#53269 [Validator] Updated Finnish translation (thunderer)

This PR was merged into the 5.4 branch.

Discussion
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[Validator] Updated Finnish translation

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#53025
| License       | MIT

Updated missing Finnish translations with help from a native speaker.

Commits
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7e9d522 [Validator] updated Finnish translation

Author: nicolas-grekas

src/Symfony/Component/Validator/Resources/translations/validators.fi.xlf

@@ -426,6 +426,10 @@
                 <source>Using hidden overlay characters is not allowed.</source>
                 <target>Piilotettuja tarkemerkkejä ei saa käyttää.</target>
             </trans-unit>
+            <trans-unit id="110">
+                <source>The extension of the file is invalid ({{ extension }}). Allowed extensions are {{ extensions }}.</source>
+                <target>Tiedostopääte ({{ extension }}) on virheellinen. Sallitut tiedostopäätteet ovat: {{ extensions }}.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>