refactor alerts layouts to centralize it on default and if theme
feedback message on notes panel
delete save button from activities, move delete button to header
move lessons nav up to the title header
fix header's layout issues, refactor css, put unit title on lesson page,
fix layout of delete unit button
Merge branch 'messages-issue-3459'
forum errors' message layout
add button to next lesson on lesson page
Merge branch '3461-melhorar-tela-atividades'
show next class button
make all tests pass
unit title dynamic and editable and copy video title to it
fix unit title and delete button layout
Merge branch 'master' into messages-issue-3459
field validation errors and recipient filter by class