[gnomemm-website] Add links to more languages

[Kjell Ahlstedt <kjellahl src gnome org>]

commit c02f7f5102441cd055c7cafc32ca658b39112916
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Thu Jan 6 15:03:48 2022 +0100

    Add links to more languages
    
    Czech, Hungarian, Korean, Slovenian, Swedish
    
    And replace .shtml by .html in some links.

 docs/C/index.docbook | 15 +++++++++++++++
 docs/C/main.xml      |  4 ++--
 2 files changed, 17 insertions(+), 2 deletions(-)
---
diff --git a/docs/C/index.docbook b/docs/C/index.docbook
index 5348c74..632792e 100644
--- a/docs/C/index.docbook
+++ b/docs/C/index.docbook
@@ -64,6 +64,9 @@
             <listitem>
               <para><ulink url="../pt_BR/index.html">Brazilian Portuguese</ulink></para>
             </listitem>
+            <listitem>
+              <para><ulink url="../cs/index.html">Czech</ulink></para>
+            </listitem>
             <listitem>
               <para><ulink url="../de/index.html">Deutsch</ulink></para>
             </listitem>
@@ -79,6 +82,18 @@
             <listitem>
               <para><ulink url="../el/index.html">Greek</ulink></para>
             </listitem>
+            <listitem>
+              <para><ulink url="../hu/index.html">Hungarian</ulink></para>
+            </listitem>
+            <listitem>
+              <para><ulink url="../ko/index.html">Korean</ulink></para>
+            </listitem>
+            <listitem>
+              <para><ulink url="../sl/index.html">Slovenian</ulink></para>
+            </listitem>
+            <listitem>
+              <para><ulink url="../sv/index.html">Swedish</ulink></para>
+            </listitem>
             <listitem>
               <para><ulink url="../zh_CN/index.html">中文</ulink></para>
             </listitem>
diff --git a/docs/C/main.xml b/docs/C/main.xml
index ea1701d..5640cf7 100644
--- a/docs/C/main.xml
+++ b/docs/C/main.xml
@@ -12,12 +12,12 @@
    typesafe callbacks, and a comprehensive set of widgets that are
    easily extensible via inheritance. You can create user interfaces
    either in code or with the <ulink url="http://glade.gnome.org/";>Glade User Interface designer</ulink>, 
using Gtk::Builder. There&apos;s
-   <ulink url="documentation.shtml">extensive documentation</ulink>,
+   <ulink url="documentation.html">extensive documentation</ulink>,
    including API reference and a tutorial.
   </para>
       <para>
    &gtkmm; is free software distributed under the GNU Library General
-    Public License (<ulink url="license.shtml">LGPL</ulink>).
+    Public License (<ulink url="license.html">LGPL</ulink>).
   </para>
       <para>
    &gtkmm; follows the official <ulink url="https://www.gnome.org/start/unstable/";> GNOME Platform Bindings 
release schedule</ulink>. This guarantees