public static com.google.protobuf.Parser<RomanizeTextRequest> parser() {
    return PARSER;
  }
<pre>
Optional. The ISO-639 language code of the input text if
known, for example, "hi" or "zh". If the source language isn't specified,
the API attempts to identify the source language automatically and returns
the source language for each content in the response.
</pre>

<code>string source_language_code = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@param value The bytes for sourceLanguageCode to set.
@return This builder for chaining.
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/RomanizeTextRequest.java