Force all language catalog names to lowercase

That way it's consistent across platforms.

locale/CMakeLists.txt

@@ -103,7 +103,7 @@ foreach( source ${SOURCES} )
    endif()
 
    set( po "${_SRCDIR}/${source}" )
-   set( mo "${dst}/${AUDACITY_NAME}.mo" )
+   set( mo "${dst}/audacity.mo" )
 
    add_custom_command(
       DEPENDS

src/prefs/GUIPrefs.cpp

@@ -300,7 +300,6 @@ wxString GUIPrefs::InitLang( wxString langCode )
    return SetLang(langCode);
 }
 
-#define IPC_APPL wxT("audacity")
 static std::unique_ptr<wxLocale> sLocale;
 
 wxString GUIPrefs::SetLang( const wxString & lang )
@@ -344,12 +343,8 @@ wxString GUIPrefs::SetLang( const wxString & lang )
    //      catalogs are search in LIFO order, so add wxstd first.
    sLocale->AddCatalog(wxT("wxstd"));
 
-// AUDACITY_NAME is legitimately used on some *nix configurations.
-#ifdef AUDACITY_NAME
-   sLocale->AddCatalog(wxT(AUDACITY_NAME));
-#else
-   sLocale->AddCatalog(IPC_APPL);
-#endif
+   // Must match TranslationExists() in Languages.cpp
+   sLocale->AddCatalog("audacity");
 
    // Initialize internationalisation (number formats etc.)
    //