tdf#115795 Solve wrong redirect behavior of "Get Online Help"

When under locale zh-TW, Help > Get Online Help would use only "zh"
as the parameter of LOLang and sent it to hub.libreoffice.org, which
would redirect to Simplified Chinese forum instead of zh_TW
ask.libreoffice.org forum.  After discussing with Guilhem he
refactored the behavior of the Hub, use LOlocale instead of LOLang,
and keep LOLang for backward compatibility.  The LibreOffice sent
LOlocale instead to avoid this problem happening again.

Change-Id: Ia9348cff88723210f693e65260bb987826a3f3ea
Reviewed-on: https://gerrit.libreoffice.org/50503Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

sfx2/source/appl/appserv.cxx

@@ -501,8 +501,8 @@ void SfxApplication::MiscExec_Impl( SfxRequest& rReq )
         {
             // Askbot has URL's normalized to languages, not locales
             // Get language from locale: ll or lll or ll-CC or lll-CC
-            OUString aLang = LanguageTag(utl::ConfigManager::getLocale()).getLanguage();
-            OUString sURL("https://hub.libreoffice.org/forum/?LOlang=" + aLang);
+
+            OUString sURL("https://hub.libreoffice.org/forum/?LOlocale=" + utl::ConfigManager::getLocale());
             sfx2::openUriExternally(sURL, false);
             break;
         }