tdf#112689 : Replace chained O(U)StringBuffer::append() with operator+

Change-Id: I119d33b171da7024daab5c4ca4488ceb495eab2f
Reviewed-on: https://gerrit.libreoffice.org/49898Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Muhammet Kara <muhammet.kara@pardus.org.tr>

basctl/source/basicide/basicbox.cxx

@@ -408,8 +408,7 @@ void LanguageBox::FillBox()
             OUString sLanguage = SvtLanguageTable::GetLanguageString( eLangType );
             if ( bIsDefault )
             {
-                sLanguage += " ";
-                sLanguage += m_sDefaultLanguageStr;
+                sLanguage += " " + m_sDefaultLanguageStr;
             }
             sal_Int32 nPos = InsertEntry( sLanguage );
             SetEntryData( nPos, new LanguageEntry( pLocale[i], bIsDefault ) );

sw/source/ui/config/mailconfigpage.cxx

@@ -383,10 +383,10 @@ void SwTestAccountSettingsDialog::Test()
 
     if (!bIsServer || !bIsLoggedIn)
     {
-        OUStringBuffer aErrorMessage(m_sErrorServer);
+        OUString aErrorMessage(m_sErrorServer);
         if (!sException.isEmpty())
-            aErrorMessage.append("\n--\n").append(sException);
-        m_pErrorsED->SetText(aErrorMessage.makeStringAndClear());
+            aErrorMessage += "\n--\n" + sException;
+        m_pErrorsED->SetText(aErrorMessage);
     }
 }