Change upload label to validate

sage_validation/file_validator/templates/upload.html

@@ -15,7 +15,7 @@
 
             <button id="submitBtn" type="submit"
                     class="w-full bg-blue-600 text-white py-3 rounded-lg hover:bg-blue-700 focus:outline-none focus:ring focus:ring-blue-400">
-                Upload
+                Validate
             </button>
 
             <!-- Loading Spinner -->