Fixes wrong display of "whitelist" and "blacklist"

By default, the behavior is to use a blacklist as all contents are
allowed. But at that time, it's "whitelist" which is displayed instead
of blacklist. I clicked on the radio buttons (for flash and images) the title turned to
"blacklist", instead of "whitelist".
Removes some unwanted spaces

The english text needs no space before ":" and "?".
I also removed a space behind "Disabled".
Merge branch from Sbgodin