en: fix issue #1069: Ligature ſt is st, not ft

dictsource/en_rules

@@ -50,7 +50,7 @@
    ff   ff     // ligatures
    fi   fi
    fl   fl
-   ſt   ft
+   ſt   st
    st   st
 
    ά   α      // some of polytonic greek to plain greek letters (list in el_rules is much longer)

tests/language-replace.test

@@ -25,7 +25,7 @@ Translate 'aeon'
 Found: 'mediaeval'
 Translate 'oeconomy'
 Found: 'phoenix'
-Translate 'loft'
+Found: 'lost'
 Translate 'history'
 EOF
 test_replace en "Æon mediæval. Œconomy phœnix. Loſt history."