Bug in language selection

[jdiazgon]

How to reproduce this bug:

• In the login page, change the language to Spanish.
• Go to the list page.
• Click on search button (you will see that it is correctly translated to Spanish.
• Close that form.
• Change language to English.
• Click on search button. The translation is not the correct one!

[jdiazgon]

@cfontsap and me have found out that header.ts is changing automatically the language to English each time a new page is loaded.