added print functionality for staff overview

refs #14101
styling of staff overview print button

refs #14101
styling of new user button

refs #8755
overview: styling of new application button

refs #8755
styling of header dropdowns

* use bootstrap to style header dropdowns like year selector
* year selector now with values for the next year and the last 10 years

refs #14101
re-styling of headers (use bootstrap legend)

refs #8755
overview: removed border of gravatar

refs #8755
re-styling of person formular

refs #8755
changed icon of role management menu point

refs #8755
re-styling of role management formular

refs #8755
styling improvement of application formular

* further added white glyphicons

refs #8755
re-styling of app detail page (action buttons)

refs #8755
re-styling of login page

refs #8755