public Builder clearLanguageCode() {
        languageCode_ = getDefaultInstance().getLanguageCode();
        bitField0_ = (bitField0_ & ~0x00000002);
        onChanged();
        return this;
      }
<pre>
The BCP-47 language code, such as "en-US" or "sr-Latn". For more
information, see
http://www.unicode.org/reports/tr35/#Unicode_locale_identifier.
</pre>

<code>string language_code = 2;</code>

@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ProductSearchResults.java