Use Latin Modern vector fonts for Latin text parts in Japanese documents.

Use Latin Modern vector fonts for Latin text parts in Japanese documents.

Latin Modern works fine with Japanese.

If "lmodern" is set for \font_roman the "lmodern.sty" package sets
sans-serif and teletype to Latin Modern fonts as well.
Therefore, \font_sans and \font_teletype are better left as "default"
(less preamble code) in the LaTeX source).