miscellaneous spelling corrections
tweak "dying words" error message to try to improve clarity

The existing error message is oblique enough that those developers who knew enough to understand what wmllint was driving at would normally know better than to use "die" for last words in the first place. While the message may help experienced developers porting the work of inexperienced authors, most developers getting this message are probably puzzled. A more direct message would be more likely to set newbie UMC authors on the right path.
increase the number of orcish warlord portrait replacements to improve variety

With three new orc alternate portraits added during 1.9, it is no longer necessary to double-up any of the substitutions for the five old-style orcish warlord portraits.

In fact, with six portraits available, one has to draw the short straw, and I chose grunt-4. I prefer grunt-5 and grunt-6, and also find them more leaderly.