let LanguageTag::convertToLocale() decide when to create a temporary

Change-Id: Id4e718eb23d4acf2ee7bddc4da1cd4e8e811be78

sfx2/source/doc/SfxDocumentMetaData.cxx

@@ -1499,7 +1499,7 @@ css::lang::Locale SAL_CALL
         SfxDocumentMetaData::getLanguage() throw (css::uno::RuntimeException, std::exception)
 {
     ::osl::MutexGuard g(m_aMutex);
-    css::lang::Locale loc( LanguageTag( getMetaText("dc:language")).getLocale( false));
+    css::lang::Locale loc( LanguageTag::convertToLocale( getMetaText("dc:language"), false));
     return loc;
 }
 

sfx2/source/doc/doctemplates.cxx

@@ -475,7 +475,7 @@ void SfxDocTplService_Impl::getDefaultLocale()
         ::osl::MutexGuard aGuard( maMutex );
         if ( !mbLocaleSet )
         {
-            maLocale = LanguageTag( utl::ConfigManager::getLocale()).getLocale( false);
+            maLocale = LanguageTag::convertToLocale( utl::ConfigManager::getLocale(), false);
             mbLocaleSet = true;
         }
     }

svl/source/numbers/numfmuno.cxx

@@ -713,7 +713,7 @@ uno::Any SAL_CALL SvNumberFormatObj::getPropertyValue( const OUString& aProperty
         }
         else if (aPropertyName == PROPERTYNAME_LOCALE)
         {
-            lang::Locale aLocale( LanguageTag( pFormat->GetLanguage()).getLocale( false));
+            lang::Locale aLocale( LanguageTag::convertToLocale( pFormat->GetLanguage(), false));
             aRet <<= aLocale;
         }
         else if (aPropertyName == PROPERTYNAME_TYPE)