Reinstate NLS

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y build-essential libtool intltool autoconf automake libcurl4-openssl-dev \
-            pkg-config libglib2.0-dev libgtk-3-dev
+            pkg-config libglib2.0-dev libgtk-3-dev autopoint
 
       - name: Run autoconf
         run: ./autogen.sh

ABOUT-NLS

@@ -0,0 +1 @@
+<https://www.gnu.org/software/gettext/manual/html_node/Users.html>

README

@@ -39,7 +39,7 @@ often with -dev or -devel in the package name, e.g. libgtk-3-dev. On Debian and
 Ubuntu systems you can install the build dependencies using:
 
   sudo apt install libtool intltool autoconf automake libcurl4-openssl-dev
-  sudo apt install pkg-config libglib2.0-dev libgtk-3-dev
+  sudo apt install pkg-config libglib2.0-dev libgtk-3-dev autopoint
 
 
 To build and install gpredict from source, first unpack the source package:

autogen.sh

@@ -39,6 +39,8 @@ rm -f config.cache
 # (containing a local copy of libintl code), and therefore has a slightly different Makefile.
 echo "- glib-gettextize."	&& \
   glib-gettextize --copy --force 	&& \
+echo "- autopoint."		&& \
+  autopoint --force	&& \
 echo "- libtoolize."		&& \
   libtoolize --force	&& \
 echo "- intltoolize."		&& \

configure.ac

@@ -72,10 +72,13 @@ AC_SUBST(PACKAGE_LIBS)
 # Note that other progs only have ALL_LINGUAS and AM_GLIB_GNU_GETTEXT
 ALL_LINGUAS="cs da de el en_GB en_US es fi fr id it lt ru th uk"
 GETTEXT_PACKAGE=gpredict
+AM_GNU_GETTEXT([external])
 AC_SUBST(GETTEXT_PACKAGE)
 AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE,
                    "$GETTEXT_PACKAGE",
                    "definition of GETTEXT_PACKAGE")
+AM_GNU_GETTEXT_REQUIRE_VERSION([0.21])
+AM_XGETTEXT_OPTION([--from-code=UTF-8])
 
 
 # compiler flags to enable generating coverage report