lib/tests/french/bescherelle: rename files containing non-ASCII characters

tests/french/bescherelle/25acquerir.gfs

@@ -0,0 +1,5 @@
+i -retain lib/src/french/BeschFre.gf
+cc -table (v_besch24 "acquérir")
+-- note that there is a discrepency between the bescherelle table
+-- numbers and the book, from 7 in the book, the gf numbers are one behind
+-- (i.e. 7 in the book is 6 in gf, etc)