ENH: replace SRTM by DEM in gui

Code/Application/Monteverdi2/mvdPreferencesDialog.cxx

@@ -194,7 +194,7 @@ void PreferencesDialog
     {
     QString srtmDirStr = I18nMainWindow::GetExistingDirectory(
         this,
-        tr("Select the directory containing SRTM tiles."));
+        tr("Select the directory containing DEM files."));
     if (srtmDirStr.isEmpty())
       { // User push default button => don't modify the value
       break;

Code/Application/Monteverdi2/mvdPreferencesDialog.ui

@@ -227,7 +227,7 @@
            </sizepolicy>
           </property>
           <property name="text">
-           <string>SRTM Directory</string>
+           <string>DEM directory</string>
           </property>
          </widget>
         </item>