refs #17599 [master] Some amendments

* Hover for Search-Inout and Search-Select in header
* Hover contrast for language option fields
* Hover over search input field
* Hover over language selection for MD and LG
** Active language is a disabled button now
** No rebuilt of the page for an active language now
* Mouse hover is identically now with keyboard hover for the header logo
* Some amendments for the header
** Add focus for search input field and search selection
** Review the language button
*** For only two configured languages there will appear only a button for the other language not beeing used currently
*** For more than two languages there will appear a dropdown menu
** Set the navbar height to 112px as suggested in the ticket