Bugfix for unicode error for profile question values
Fix userid/username error in client auth cookie.
Implement remember-me option in client.
Another missing userid/username update.
Change remember-me label. fixes #59
Update translations.
Update to NuPlone 1.2/htmllauntry 2.0
Fix bad placeholder translaction. Fixes tno/230
Show introduction in survey view.
Fix utf8 handling in profile form.

This copies the fix from 9d8f129ddc482211f1bd05b30c30d9255ad1bff8 to the
main profile form.
Remove undesirable space.
Terminate sentence with a dot.
Sort recent session first.
Remove more undesirable spaces.
Restore tabindex so pwreset link is skipped.
Prepare 5.1 release.
Onwards
Merge branch 'stable-5'