public Builder addTargetLanguageCodesBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      ensureTargetLanguageCodesIsMutable();
      targetLanguageCodes_.add(value);
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
Required. The BCP-47 language code to use for translation of the input
document. Specify up to 10 language codes here.
</pre>

<code>repeated string target_language_codes = 3 [(.google.api.field_behavior) = REQUIRED];
</code>

@param value The bytes of the targetLanguageCodes to add.
@return This builder for chaining.
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/BatchTranslateDocumentRequest.java