Prehlásenie -> Vyhlásenie

V slovenčine slovo `prehlásenie` nemá rovnaký význam ako české `prohlášení`, adevátny preklad je `vyhlásenie`.

Viz.
http://slovniky.juls.savba.sk/?w=prehl%C3%A1si%C5%A5&s=exact&c=qb63&d=kssj4&d=psp&d=sssj&d=sssj2&d=scs&d=sss&d=peciar&ie=utf-8&oe=utf-8#
http://jazykovaporadna.sme.sk/q/8662/

Added a mention about the `prop` thesis type to the Faculty of Informatics (MU Brno, Czech Republic) user guide.

This conditional determines, whether the scanned assignment
specified by the `assignment` key is going to be hidden in the
digital version of the document. It is by default, but some style
files (`/mu/sci`) switch this, so that the scanned assignment is
included in the digital version.