[Validator] Update sr_Latn 120:This value is not a valid slug.

inline with the tone and terminology of the rest of the translations

Author: kaznovac

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

@@ -468,7 +468,7 @@
             </trans-unit>
             <trans-unit id="120">
                 <source>This value is not a valid slug.</source>
-                <target state="needs-review-translation">Ova vrednost nije važeći slug.</target>
+                <target>Ova vrednost nije validan slug.</target>
             </trans-unit>
         </body>
     </file>