File temp = createTempFile();
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N + I18N, Files.toString(temp, UTF_16LE));
  }

src/main/resources/
├── fess_config.properties     # Main config
├── app.xml                    # DI configuration
├── fess_label_*.properties    # UI labels (i18n)
├── fess_message_*.properties  # Validation messages (i18n)
└── fess_indices/              # OpenSearch index mappings

src/main/webapp/WEB-INF/view/  # JSP templates
```

## DBFlute Code Generation

    URL resource = getClass().getResource("testdata/i18n.txt");
    assertEquals(I18N, Resources.toString(resource, UTF_8));
    assertThat(Resources.toString(resource, US_ASCII)).isNotEqualTo(I18N);
  }

  public void testToByteArray() throws IOException {
    URL resource = getClass().getResource("testdata/i18n.txt");
    assertThat(Resources.toByteArray(resource)).isEqualTo(I18N.getBytes(UTF_8));
  }

    File temp = createTempFile();
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N + I18N, Files.toString(temp, UTF_16LE));
  }

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(I18N)), wrapAsGenericAppendable(builder2));
    assertEquals(I18N, builder2.toString());
    assertEquals(I18N.length(), copied);
  }

  public void testCopy_toStringBuilder_fromReader() throws IOException {
    StringBuilder builder = new StringBuilder();

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(I18N)), wrapAsGenericAppendable(builder2));
    assertEquals(I18N, builder2.toString());
    assertEquals(I18N.length(), copied);
  }

  public void testCopy_toStringBuilder_fromReader() throws IOException {
    StringBuilder builder = new StringBuilder();

  public static ByteSinkFactory fileByteSinkFactory() {
    return new FileByteSinkFactory(null);
  }

  public static ByteSinkFactory appendingFileByteSinkFactory() {
    String initialString = IoTestCase.ASCII + IoTestCase.I18N;
    return new FileByteSinkFactory(initialString.getBytes(UTF_8));
  }

  public static CharSourceFactory fileCharSourceFactory() {
    return new FileCharSourceFactory();
  }

              "CharSource.empty[]", SourceSinkFactories.emptyCharSourceFactory(), asByteSource));
    }
    suite.addTestSuite(CharSourceTest.class);
    return suite;
  }

  private static final String STRING = ASCII + I18N;
  private static final String LINES = "foo\nbar\r\nbaz\rsomething";
  private static final ImmutableList<String> SPLIT_LINES =
      ImmutableList.of("foo", "bar", "baz", "something");

  private TestCharSource source;

              "CharSource.empty[]", SourceSinkFactories.emptyCharSourceFactory(), asByteSource));
    }
    suite.addTestSuite(CharSourceTest.class);
    return suite;
  }

  private static final String STRING = ASCII + I18N;
  private static final String LINES = "foo\nbar\r\nbaz\rsomething";
  private static final ImmutableList<String> SPLIT_LINES =
      ImmutableList.of("foo", "bar", "baz", "something");

  private TestCharSource source;

# Adding a New Language to Fess

This guide explains how to add internationalization (i18n) support for a new language in Fess.

## Overview

Fess uses a two-tier language support system:

1. **Full UI Translation** (13 languages): Complete user interface translation with label and message files
2. **Search/Analysis Support** (40+ languages): Language-specific text analysis for search indexing