[LyX/master] Update language support documentation and comments.

[Günter Milde]

commit e5435cd61e34868b3887be51a3b195a77abe21dd
Author: Günter Milde <mi...@lyx.org>
Date:   Fri Apr 12 11:46:21 2019 +0200

    Update language support documentation and comments.
---
 autotests/export/latex/supported-languages.lyx |    5 +++++
 lib/languages                                  |    7 +++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/autotests/export/latex/supported-languages.lyx 
b/autotests/export/latex/supported-languages.lyx
index 9b7b470..58c855e 100644
--- a/autotests/export/latex/supported-languages.lyx
+++ b/autotests/export/latex/supported-languages.lyx
@@ -2549,6 +2549,11 @@ LyX korean
 
 \begin_layout Labeling
 \labelwidthstring 00.00.0000
+Polyglossia korean (LyX support missing)
+\end_layout
+
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
 Encoding euc-kr
 \end_layout
 
diff --git a/lib/languages b/lib/languages
index c766132..583ed89 100644
--- a/lib/languages
+++ b/lib/languages
@@ -853,8 +853,8 @@ Language italian
        LangCode         it_IT
 End
 
-# Since japanese does not load fontenc, we set
-# InternalEncoding to true.
+# Since 2016-12-18, babel-japanese works with non-TeX fonts (Xe/LuaTeX), too
+# (use with "Japanese (bxjs)" or standard document classes)
 Language japanese
        GuiName          "Japanese"
        HasGuiSupport    true
@@ -905,8 +905,10 @@ Language khmer
        LangCode         km_KH
 End
 
+# Fixme: activate Polyglossia support (file format change)
 Language korean
        GuiName         "Korean"
+       #PolyglossiaName  korean
        Encoding        euc-kr
        QuoteStyle      cjkangle
        DateFormats     "yyyy년 M월 d일|yyyy. M. d.|yy. M. d."
@@ -1340,6 +1342,7 @@ Language telugu
        LangCode         te_IN
 End
 
+# alternative support with CJK package and Babel name "thaicjk"
 Language thai
        GuiName          "Thai"
        BabelName        thai