Fixup polyglossia-languages test file

* Branch Kazakh as it is now babel-only
* Setup fonts for Chinese via fontspec
* Setup proper fonts for Japanese
* Use proper Japanese language variant

autotests/export/latex/languages/supported-languages.lyx

@@ -3402,7 +3402,7 @@ status open
 \begin_layout Quote
 
 \series bold
-\lang japanese-cjk
+\lang japanese
 日本語
 \series default
 （にほんご、にっぽんご[注 1]）は、主に日本国内や日本人同士の間で使用されている言語である。
@@ -3548,6 +3548,11 @@ Script Kannada
 LangCode kn_IN
 \end_layout
 
+\begin_layout Standard
+\begin_inset Branch babel-only
+inverted 0
+status open
+
 \begin_layout Subsection*
 Kazakh
 \end_layout
@@ -3581,7 +3586,7 @@ LangCode kk_KZ
 \end_layout
 
 \begin_layout Itemize
-Not supported by Babel nor Polyglossia.
+Not supported by Polyglossia.
 \end_layout
 
 \begin_layout Itemize
@@ -3638,6 +3643,11 @@ As of 2018,
  and Afghanistan also use an Arabic-derived alphabet.
 \end_layout
 
+\end_inset
+
+
+\end_layout
+
 \begin_layout Subsection*
 Khmer
 \end_layout

autotests/export/latex/languages/supported-languages_polyglossia-XeTeX.lyx

@@ -1,5 +1,5 @@
 #LyX 2.4 created this file. For more info see https://www.lyx.org/
-\lyxformat 589
+\lyxformat 620
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -23,34 +23,15 @@
 \newfontfamily\thaanafont{FreeSerif} % prevent "missing script tag" error
 %\newfontfamily\thaanafont{Noto Sans Thaana} % works, too
 \newfontfamily\tibetanfont{Noto Serif Tibetan}
-
-% Font setup for Japanese (not supported by Polyglossia)
-\usepackage{ifxetex}
-\ifxetex
-  \usepackage{xeCJK} % https://ctan.org/pkg/xecjk
-  \setCJKmainfont{IPAexMincho}
-  \setCJKsansfont{IPAexGothic}
-\else
-% with LuaTeX, https://www.ctan.org/pkg/luatexja
-% see https://tex.stackexchange.com/questions/222980/how-to-use-chinese-with-lualatex
-% Unfortunately, this conflicts with Korean font setup via Polyglossia
-% and leads to missing glyphs: (church slavonic ⁙ (U+2059)) and
-% typographical quotes).
-% \ifdefined\luatexversion
-%   %\usepackage{luatexja-fontspec}
-%   \usepackage[match]{luatexja-fontspec}
-%   % use Mainfont for Greek and Cyrillic:
-%   \ltjsetparameter{jacharrange={-2}}
-%   \setmainjfont{IPAexMincho}
-%   \setsansjfont{IPAexGothic}
-%   %\setmonojfont{WenQuanYi Micro Hei Mono}
-\fi
+\newfontfamily\CJKfont{IPAexMincho}
+\newfontfamily\CJKfontsf{IPAexGothic}
+\newfontfamily\japanesefont[script=CJK]{IPAexMincho}
 \end_preamble
 \use_default_options false
 \begin_modules
 enumitem
 \end_modules
-\maintain_unincluded_children false
+\maintain_unincluded_children no
 \language english
 \language_package auto
 \inputencoding auto-legacy
@@ -110,72 +91,73 @@ enumitem
 \suppress_date false
 \justification false
 \use_refstyle 0
+\use_formatted_ref 0
 \use_minted 0
 \use_lineno 0
 \branch only-as-document-language
 \selected 0
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch babel-only
 \selected 0
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch non-TeX-fonts-only
 \selected 1
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch polyglossia-only
 \selected 1
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch CJK
 \selected 0
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch debug
 \selected 0
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch conflict-rus-belarus
 \selected 1
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch conflict-es-gl
 \selected 0
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch conflict-bg-mk
 \selected 1
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch conflict-babel-non-TeX-fonts
 \selected 1
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch standalone
 \selected 0
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch conflict-luatex
 \selected 1
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \branch conflict-ko
 \selected 1
 \filename_suffix 0
-\color #faf0e6
+\color background background
 \end_branch
 \index Stichwortverzeichnis
 \shortcut idx
@@ -195,9 +177,13 @@ enumitem
 \tablestyle default
 \tracking_changes false
 \output_changes false
+\change_bars false
+\postpone_fragile_content false
 \html_math_output 0
 \html_css_as_file 0
 \html_be_strict false
+\docbook_table_output 0
+\docbook_mathml_prefix 1
 \end_header
 
 \begin_body