Shinsuke Sugaya <******@****.***> 1774681159 +0900

                }
                return "/error/system.jsp";
            }
        });
    }

    protected Consumer<List<String>> createMessageNameList() {
        return nameList -> nameList.add("fess_message");
    }

    protected FessUserLocaleProcessProvider createUserLocaleProcessProvider() {
        return new FessUserLocaleProcessProvider();
    }

```
src/main/resources/
├── fess_label.properties           # Base English labels (fallback)
├── fess_label_[locale].properties  # Language-specific labels (~1,056 lines)
├── fess_message.properties         # Base English messages (fallback)
└── fess_message_[locale].properties # Language-specific messages (~200 lines)
```

### Naming Convention

- **Language only**: `fess_label_en.properties`, `fess_label_ja.properties`

        // Setup - test with different message codes
        final String message = "Query validation error";
        final VaMessenger<FessMessages> unknownErrorCode =
                messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY);
        final VaMessenger<FessMessages> parseErrorCode =
                messages -> messages.addErrorsInvalidQueryParseError(UserMessages.GLOBAL_PROPERTY_KEY);

        // Execute

        // Setup - test with different message codes
        final String message = "Test message";
        final VaMessenger<FessMessages> loginErrorCode = messages -> messages.addErrorsSsoLoginError(UserMessages.GLOBAL_PROPERTY_KEY);
        final VaMessenger<FessMessages> logoutErrorCode = messages -> messages.addSuccessSsoLogout(UserMessages.GLOBAL_PROPERTY_KEY);

        // Execute

        assertEquals("{errors.front_footer}", FessMessages.ERRORS_front_footer);
        assertEquals("{errors.front_prefix}", FessMessages.ERRORS_front_prefix);
        assertEquals("{errors.front_suffix}", FessMessages.ERRORS_front_suffix);
        assertEquals("{errors.header}", FessMessages.ERRORS_HEADER);
        assertEquals("{errors.footer}", FessMessages.ERRORS_FOOTER);

        final List<VaMessenger<FessMessages>> errorMessages = new ArrayList<>();
        AdminSearchlistAction.validateFields(doc, errorMessages::add);

        assertFalse(errorMessages.isEmpty());

        // Verify error messages use field names without doc. prefix
        final FessMessages messages = new FessMessages();
        errorMessages.forEach(m -> m.message(messages));

     * Adds a password validation error message to the messages object based on the error key.
     *
     * @param messages the FessMessages object to add the error to
     * @param errorKey the error key identifying the type of password validation error
     */
    protected void addPasswordValidationError(final FessMessages messages, final String errorKey) {
        switch (errorKey) {
        case "errors.password_length":

import org.codelibs.fess.helper.QueryHelper;
import org.codelibs.fess.helper.SearchHelper;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.mylasta.action.FessMessages;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.RenderDataUtil;