Need help on translating documentation

I am working on translating PostgreSQL 13 documentation to Japanese
and having a problem with catalogs.sgml. Due to major format change in
13, the number of places need to translate in 13 is large.

12:
<row>
<entry><structfield>aggnumdirectargs</structfield></entry>
<entry><type>int2</type></entry>
<entry></entry>
<entry>Number of direct (non-aggregated) arguments of an ordered-set or
hypothetical-set aggregate, counting a variadic array as one argument.
If equal to <structfield>pronargs</structfield>, the aggregate must be variadic
and the variadic array describes the aggregated arguments as well as
the final direct arguments.
Always zero for normal aggregates.</entry>
</row>

13:
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>aggnumdirectargs</structfield> <type>int2</type>
</para>
<para>
Number of direct (non-aggregated) arguments of an ordered-set or
hypothetical-set aggregate, counting a variadic array as one argument.
If equal to <structfield>pronargs</structfield>, the aggregate must be variadic
and the variadic array describes the aggregated arguments as well as
the final direct arguments.
Always zero for normal aggregates.
</para></entry>
</row>

It looks like in many places the description part of the document are
same in 12 and 13. Since we already have translated 12 documents, I
wonder if there's a (semi) automated way to reuse the 12 Japanese
translation for 13 doc. I want to avoid manual cut&paste work.

Any suggestions are welcome.
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp