Fix project wizard / German.

...to not suggest invalid file paths.

share/qtcreator/translations/qtcreator_de.ts

@@ -19930,7 +19930,7 @@ p, li { white-space: pre-wrap; }
     <message>
         <location filename="../../../src/plugins/projectexplorer/baseprojectwizarddialog.cpp" line="+124"/>
         <source>untitled</source>
-        <translation type="unfinished">kein Titel</translation>
+        <translation type="unfinished"></translation>
     </message>
 </context>
 <context>

src/plugins/projectexplorer/baseprojectwizarddialog.cpp

@@ -121,6 +121,8 @@ Utils::ProjectIntroPage *BaseProjectWizardDialog::introPage() const
 QString BaseProjectWizardDialog::uniqueProjectName(const QString &path)
 {
     const QDir pathDir(path);
+    //: File path suggestion for a new project. If you choose
+    //: to translate it, make sure it is a valid path name without blanks.
     const QString prefix = tr("untitled");
     for (unsigned i = 0; ; i++) {
         QString name = prefix;