private void ensureInputConfigsIsMutable() {
      if (!((bitField0_ & 0x00000008) != 0)) {
        inputConfigs_ =
            new java.util.ArrayList<com.google.cloud.translate.v3beta1.BatchDocumentInputConfig>(
                inputConfigs_);
        bitField0_ |= 0x00000008;
      }
    }
<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