propose DAT files in load dialog

src/gui/load_results_dialog/loadresultsdialog.cpp

@@ -88,7 +88,7 @@ void LoadResultsDialog::chooseFiles() {
         QString default_location = settings.value("path/identificationfiles", "").toString();
 
         QStringList filenames = QFileDialog::getOpenFileNames(this,tr("identification files"),default_location,
-                                tr("X!Tandem, mzIdentML or pepxml files (*.xml *.mzid *.pep);;all files (*)") );
+                                tr("X!Tandem, Mascot DAT or mzIdentML files (*.xml *.mzid *.dat);;all files (*)") );
 
         if (filenames.size() > 0) {
             settings.setValue("path/identificationfiles", QFileInfo(filenames[0]).absolutePath());