Internationalization of excerpt function in "Latest Posts" block

[tmatsuur]

In "Latest Posts" block, when extracting excerpts from posted articles,
they are always separated by the specified number of words.

The Japanese text is not space-separated, so the excerpt displayed by
the "Latest posts" block is not shortened.

The wp_trim_words function is used to extract excerpts from "post".
This function determines whether to cut off by the number of words or
the number of characters by the following conditions.

if ( strpos( _x( 'words', 'Word count type. Do not translate!' ), 'characters' ) === 0 &&
    preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {

I think it is desirable to be able to extract the "latest posts" block
excerpt under the same conditions.