Steps to reproduce the issue

Create a new installation with the "sample testing" data and then at the end of installation choose also the multilingual feature.

Expected result

All the menu items in the Top Menu should works both english and the language you choose to use the multilingual feature.

Actual result

404 Error when you click on the "Parks" menu item in other language than english. Only works in english.

System information (as much as possible)

Additional comments

This occurs becouse the sample data in the sample_testing.sql in the "#__menu" table create the "Australian Parks" menu with "en-GB" instead '*' and as the "Parks" menu item in the Top Menu is just an alias to the "Parks Home" menu item of the "Australian Parks" menu, the the resoult is and 404 error page due the multilingual feature.

To solve this, it is necessary modify the sample_testing.sql file and replace, in the "#__menu" table the references to the "en-GB" language, for the '*' to make it available in all the languages.

As my skills does not allow me to creat a new pull in the GitHub I put the solution here:
We have to replace the "en-GB" reference for a '*' in the lines 385, 387, 388, 389, 439, 440 of the /installation/sql/mysql/sample_testing.sql file