Fix setting Interlingua as GUI language

The problem came from the fact that Qt associates Interlingua to locale C.
Now, we do not rely anymore on the Qt locale to set the language. I suspect that the problem will still exist if the system locale is ia_IA.

Fixes bug #9267.

diff --git a/src/frontends/qt4/GuiApplication.cpp b/src/frontends/qt4/GuiApplication.cpp
index 39b73cf062060e6eb8f1e7e5ff347341885e73a4..f858d85c90326e017ed65c8193ed3f0a2e61df94 100644 (file)
--- a/src/frontends/qt4/GuiApplication.cpp
+++ b/src/frontends/qt4/GuiApplication.cpp
@@ -192,16 +192,19 @@ frontend::Application * createApplication(int & argc, char * argv[])
 void setLocale()
 {
        QLocale theLocale;
+       string code;
        if (lyxrc.gui_language == "auto") {
                theLocale = QLocale::system();
+               code = fromqstr(theLocale.name());
+               // Qt tries to outsmart us and transforms en_US to C.
+               if (code == "C")
+                       code = "en_US";
        } else {
                Language const * l = languages.getLanguage(lyxrc.gui_language);
-               string const code = l ? l->code() : string();
+               code = l ? l->code() : string();
                theLocale = QLocale(toqstr(code));
        }
-       string const code = fromqstr(theLocale.name());
-       // Qt tries to outsmart us and transforms en_US to C.
-       Messages::guiLanguage((code == "C") ? "en_US" : code);
+       Messages::guiLanguage(code);
        QLocale::setDefault(theLocale);
        setlocale(LC_NUMERIC, "C");
 }