public Builder setLanguageCodeBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      languageCode_ = value;
      bitField0_ |= 0x00004000;
      onChanged();
      return this;
    }
<pre>
The language of the posting. This field is distinct from
any requirements for fluency that are associated with the job.

Language codes must be in BCP-47 format, such as "en-US" or "sr-Latn".
For more information, see
[Tags for Identifying Languages](https://tools.ietf.org/html/bcp47){:
class="external" target="_blank" }.

If this field is unspecified and
[Job.description][google.cloud.talent.v4beta1.Job.description] is present,
detected language code based on
[Job.description][google.cloud.talent.v4beta1.Job.description] is assigned,
otherwise defaults to 'en_US'.
</pre>

<code>string language_code = 15;</code>

@param value The bytes for languageCode to set.
@return This builder for chaining.
java-talent/proto-google-cloud-talent-v4beta1/src/main/java/com/google/cloud/talent/v4beta1/Job.java