Fix for code snippet in commandlineparser documentation

One line in the code snippet wasn't translated whlie the others were.

Change-Id: Ie77a317833f800087b485609cd001dd26060a40f
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

src/corelib/doc/snippets/code/src_corelib_tools_qcommandlineparser_main.cpp

@@ -59,7 +59,8 @@ int main(int argc, char *argv[])
     parser.addOption(showProgressOption);
 
     // A boolean option with multiple names (-f, --force)
-    QCommandLineOption forceOption(QStringList() << "f" << "force", "Overwrite existing files.");
+    QCommandLineOption forceOption(QStringList() << "f" << "force",
+            QCoreApplication::translate("main", "Overwrite existing files."));
     parser.addOption(forceOption);
 
     // An option with a value