Fall back to language name for translations lookup if locale name fails

For locales like de_AT, the current code only looks in
share/locale/de_AT/ and share/locale/de-AT/ for translation catalogs,
but not in share/locale/de/ where they most likely are.
That's because bcp47Name() returns "de-AT" for de_AT (though in the
case of de_DE e.g. it does return "de").

This patch additionally tries to fall back to the general language by
taking the part of the locale name before the first '_'.

Differential Revision: https://phabricator.kde.org/D9793

1 files changed, 6 insertions, 1 deletions

diff --git a/modules/ECMQmLoader.cpp.in b/modules/ECMQmLoader.cpp.in
index 12a2d146..f636ecc4 100644
--- a/modules/ECMQmLoader.cpp.in
+++ b/modules/ECMQmLoader.cpp.in
@@ -65,7 +65,12 @@ namespace {
         QLocale locale = QLocale::system();
         if (locale.name() != QStringLiteral("en")) {
             if (!loadTranslation(locale.name())) {
-                loadTranslation(locale.bcp47Name());
+                if (!loadTranslation(locale.bcp47Name())) {
+                    const int i = locale.name().indexOf(QLatin1Char('_'));
+                    if (i > 0) {
+                        loadTranslation(locale.name().left(i));
+                    }
+                }
             }
         }
     }