Dates: Added exact-match 'eaѕter' logic

- Without checking for an exact match for 'easter', the date 'easter' is a
  valid partial match for 'eastermonday'.

src/text.cpp

@@ -515,9 +515,11 @@ bool closeEnough (
   const std::string& attempt,
   unsigned int minLength /* = 0 */)
 {
+  // An exact match is accepted first.
   if (compare (reference, attempt, false))
     return true;
 
+  // A partial match will suffice.
   if (attempt.length () < reference.length () &&
       attempt.length () >= minLength)
     return compare (reference.substr (0, attempt.length ()), attempt, false);