Add the last of the apostrophe-related fixes. Words that end in "x"

will now get proper "'s" endings; simple_monster_message() and simple_god_message() will now replace all "s's" with "'s" (there's no need to worry about the "its" rule here, since invisible monsters are excluded from the former, and no gods are named "It" or are invisible with regard to the latter); and the tutorial will now generically apostrophize the one god name it has (since doing the aforementioned replacement would take too long on the tutorial text). The high score message still appends "'s" unconditionally to user names, but they may not be English, so that seems okay to me.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8281 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 6, 2009
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