lyx2lyx error: \begin{english} is inside a bold layout instead of outside

[Scott Kostyshak]

The following tests are failing on master:

  export/examples/ko/Welcome_lyx22 (Failed)
  export/examples/ko/Welcome_lyx23 (Failed)

To reproduce manually, export Welcome.lyx in mater to LyX 2.3.x format.
Then open the created file either with master or 2.3.x and compile with
the default format (XeLaTeX) and get the following error:

  ! Extra }, or forgotten \endgroup.

This happens because the ERT "\begin{English}" is inside the bold
layout. Either we need to end it at the end of the bold layout, or we
need to move the "\begin{English}" before the bold starts. That is, the
current LaTeX code being produced is:

  \textbf{\begin{english}Note for Linux users:}

Scott
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