title: Test SlopGenerator with special characters

Of course, the SlopParser must escape special chars properly, as in
<element-names> or equations: x < y & y < z implies x < z.

And, provided the encoding is set correctly, accented chars
must be processed cleanly:
french-test: Les éléments déchaînés se sont révélés.
german-test: Ämterkonsultation wird übergeben.