### Cache Behavior

- Language items are cached for 1 hour by `SystemHelper`
- Restart the application after adding new languages

### Auto-Generated Files

Never edit these files manually (marked with `@author FreeGen`):
- `FessLabels.java`
- `FessMessages.java`

Always regenerate them using `mvn dbflute:freegen`

## Complete Example: Adding Swedish (sv)

```bash
# 1. Navigate to resources directory

import java.lang.reflect.Type;

import org.codelibs.core.exception.IllegalAccessRuntimeException;
import org.codelibs.core.exception.InvocationTargetRuntimeException;

/**
 * Utility class for method operations.
 *
 * @author higa
 */
public abstract class MethodUtil {

    /**
     * Do not instantiate.
     */
    protected MethodUtil() {
    }

    /**

import org.dbflute.system.DBFluteSystem;
import org.dbflute.twowaysql.style.BoundDateDisplayStyle;
import org.opensearch.action.search.SearchRequestBuilder;
import org.opensearch.common.unit.TimeValue;

/**
 * @author ESFlute (using FreeGen)
 */
public abstract class EsAbstractConditionBean implements ConditionBean {

    // ===================================================================================

import java.io.StringWriter;
import java.io.Writer;
import java.nio.CharBuffer;
import java.util.List;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link CharStreams}.
 *
 * @author Chris Nokleberg
 */
@NullUnmarked
public class CharStreamsTest extends IoTestCase {

  private static final String TEXT = "The quick brown fox jumped over the lazy dog.";

import java.util.Arrays;
import java.util.Collection;
import org.jspecify.annotations.NonNull;
import org.jspecify.annotations.Nullable;

/**
 * Static utility methods pertaining to object arrays.
 *
 * @author Kevin Bourrillion
 * @since 2.0
 */
@GwtCompatible
@SuppressWarnings("AvoidObjectArrays")
public final class ObjectArrays {

  private ObjectArrays() {}

  /**

 * by multiple concurrent threads.
 *
 * @param <K> the type of the cache's keys, which are not permitted to be null
 * @param <V> the type of the cache's values, which are not permitted to be null
 * @author Charles Fry
 * @since 10.0
 */
@DoNotMock("Use CacheBuilder.newBuilder().build()")
@GwtCompatible
public interface Cache<K, V> {

  /**

 * below all values or above all values. With this object defined in this way, an interval can
 * always be represented by a pair of {@code Cut} instances.
 *
 * @author Kevin Bourrillion
 */
@SuppressWarnings("rawtypes") // https://github.com/google/guava/issues/989
@GwtCompatible
abstract class Cut<C extends Comparable> implements Comparable<Cut<C>>, Serializable {
  final C endpoint;

import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Class that contains nested abstract tests for filtered collection views, along with their
 * implementation helpers.
 *
 * @author Louis Wasserman
 */
/*
 * TODO(cpovirk): Should all the tests for filtered collections run under GWT, too? Currently, they
 * don't.
 */
@NullUnmarked
public final class FilteredCollectionsTestUtil {

import java.io.StringWriter;
import java.io.Writer;
import java.nio.CharBuffer;
import java.util.List;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link CharStreams}.
 *
 * @author Chris Nokleberg
 */
@NullUnmarked
public class CharStreamsTest extends IoTestCase {

  private static final String TEXT = "The quick brown fox jumped over the lazy dog.";

/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,