Changed "up-to-date" to "up to date"

Hi, I changed the hyphenation of "Your system is up-to-date" to "Your system is up to date". This is also the hyphenation that pacman uses and the one that is recommended by the Oxford English Dictionary (https://english.stackexchange.com/a/180617). I simply replaced all occurrences and I haven't tested if it breaks anything.

See also pamac!446 (closed)