minor #43488 [Validator] Add missing validator polish translation (chikaldirick)

This PR was squashed before being merged into the 4.4 branch.

Discussion
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[Validator] Add missing validator polish translation

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #43449
| License       | MIT
| Doc PR        | N/A

Commits
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3eecdd1527 [Validator] Add missing validator polish translation

Author: fabpot

Resources/translations/validators.pl.xlf

@@ -390,6 +390,10 @@
                 <source>This value should be a valid expression.</source>
                 <target>Ta wartość powinna być prawidłowym wyrażeniem.</target>
             </trans-unit>
+            <trans-unit id="101">
+                <source>This value is not a valid CSS color.</source>
+                <target>Ta wartość nie jest prawidłowym kolorem CSS.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>