Update to the Filter

[Sammeth.]

Following an unsuccesful bout of unfiltering, we have decided it be best to refilter abbreviation which could be classed as avoiding the filter. Its best to treat everything in the same manner. Moderators have been informed and so have you, so there shouldn't be any excuses! The words readded to the filter are as follows:

lmfao
wtf
cbf
omfg
fml