Add version suffix to gettext message catalog files

Change "make install" to install catalog files with version suffix and
modify the sources to look for suffixed catalog first, while still
falling back to just the base name if the variant with the version is
not found, because the message catalogs are copied manually in practice
under MSW/macOS systems and so won't have the version suffix there.

This allows to make message catalogs installed by different
wxWidgets versions to coexist on the same system, see
https://groups.google.com/g/wx-users/c/L9gC8UgrO6Y

Closes #2219

Co-Authored-By: Vadim Zeitlin <vadim@wxwidgets.org>

Makefile.in

@@ -14778,14 +14778,14 @@ locale_install:
 	$(INSTALL_DIR) $(DESTDIR)$(datadir)/locale/$$l ; \
 	$(INSTALL_DIR) $(DESTDIR)$(datadir)/locale/$$l/LC_MESSAGES ; \
 	if test -f $(srcdir)/locale/$$l.mo ; then \
-	$(INSTALL_DATA) $(srcdir)/locale/$$l.mo $(DESTDIR)$(datadir)/locale/$$l/LC_MESSAGES/wxstd.mo ; \
+	$(INSTALL_DATA) $(srcdir)/locale/$$l.mo $(DESTDIR)$(datadir)/locale/$$l/LC_MESSAGES/wxstd-$(WX_RELEASE).mo ; \
 	fi ; \
 	done
 
 locale_uninstall: 
 	for l in $(LOCALE_LINGUAS) ; do \
-	if test -f $(DESTDIR)$(datadir)/locale/$$l/LC_MESSAGES/wxstd.mo ; then \
-	rm -f $(DESTDIR)$(datadir)/locale/$$l/LC_MESSAGES/wxstd.mo ; \
+	if test -f $(DESTDIR)$(datadir)/locale/$$l/LC_MESSAGES/wxstd-$(WX_RELEASE).mo ; then \
+	rm -f $(DESTDIR)$(datadir)/locale/$$l/LC_MESSAGES/wxstd-$(WX_RELEASE).mo ; \
 	fi ; \
 	done
 

build/bakefiles/wx.bkl

@@ -137,7 +137,7 @@
         <using module="gettext"/>
         <gettext-catalogs id="locale">
             <srcdir>$(SRCDIR)/locale</srcdir>
-            <catalog-name>wxstd</catalog-name>
+            <catalog-name>wxstd-$(WX_RELEASE)</catalog-name>
             <linguas>
                 ca cs da de el es fi fr hu id it ja nl pl ru sl sv tr uk
                 zh zh_CN zh_TW

src/common/translation.cpp

@@ -45,6 +45,7 @@
 #include "wx/fontmap.h"
 #include "wx/scopedptr.h"
 #include "wx/stdpaths.h"
+#include "wx/version.h"
 #include "wx/private/threadinfo.h"
 
 #ifdef __WINDOWS__
@@ -1519,10 +1520,17 @@ wxArrayString wxTranslations::GetAvailableTranslations(const wxString& domain) c
 
 bool wxTranslations::AddStdCatalog()
 {
-    if ( !AddCatalog(wxS("wxstd")) )
-        return false;
+    // Try loading the message catalog for this version first, but fall back to
+    // the name without the version if it's not found, as message catalogs
+    // typically won't have the version in their names under non-Unix platforms
+    // (i.e. where they're not installed by our own "make install").
+    if ( AddCatalog("wxstd-" wxSTRINGIZE(wxMAJOR_VERSION) "." wxSTRINGIZE(wxMINOR_VERSION)) )
+        return true;
 
-    return true;
+    if ( AddCatalog(wxS("wxstd")) )
+        return true;
+
+    return false;
 }
 
 #if !wxUSE_UNICODE