minor #39707 [Validator] mistake (gbere)

This PR was merged into the 4.4 branch.

Discussion
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[Validator] mistake

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT

Commits
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caa59fae81 mistake

Author: nicolas-grekas

Resources/translations/validators.ca.xlf

@@ -332,7 +332,7 @@
             </trans-unit>
             <trans-unit id="86">
                 <source>This value should be valid JSON.</source>
-                <target>Aquest valor hauria de ser JSON vàlid.</target>
+                <target>Aquest valor hauria de ser un JSON vàlid.</target>
             </trans-unit>
             <trans-unit id="87">
                 <source>This collection should contain only unique elements.</source>