Empty comment block at beginning of line

With comments spanning multiple lines, an extraneous <span class="comment"></span> is left at the beginning of the line following the comment block.

This is caused by the \n of every line being changed to </span>\n<span class="comment">.

Though harmless, it is inelegant. It can easily be removed, contributing to transmit less data.

Proposed patch:

In Lang, sub processcomment

!-87 110304 (after line 87, insert:)
! $$frag =~ s#<span class=\"comment\"></span>$## ; #remove excess marking
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