parser: shorten prefix of alias parsing errors

These messages seemed to be a bit long. We should try making them fit to
80-col console.

mercurial/parser.py

@@ -447,15 +447,13 b' class basealiasrules(object):'
         repl = efmt = None
         name, args, err = cls._builddecl(decl)
         if err:
-            efmt = _('failed to parse the declaration of %(section)s '
-                     '"%(name)s": %(error)s')
+            efmt = _('bad declaration of %(section)s "%(name)s": %(error)s')
         else:
             try:
                 repl = cls._builddefn(defn, args)
             except error.ParseError as inst:
                 err = parseerrordetail(inst)
-                efmt = _('failed to parse the definition of %(section)s '
-                         '"%(name)s": %(error)s')
+                efmt = _('bad definition of %(section)s "%(name)s": %(error)s')
         if err:
             err = efmt % {'section': cls._section, 'name': name, 'error': err}
         return alias(name, args, err, repl)

tests/test-command-template.t

@@ -3768,10 +3768,10 b' Unparsable alias:'
   $ hg debugtemplate --config templatealias.bad='x(' -v '{bad}'
   (template
     ('symbol', 'bad'))
-  abort: failed to parse the definition of template alias "bad": at 2: not a prefix: end
+  abort: bad definition of template alias "bad": at 2: not a prefix: end
   [255]
   $ hg log --config templatealias.bad='x(' -T '{bad}'
-  abort: failed to parse the definition of template alias "bad": at 2: not a prefix: end
+  abort: bad definition of template alias "bad": at 2: not a prefix: end
   [255]
 
   $ cd ..

tests/test-revset.t

@@ -1967,12 +1967,12 b' test unknown reference:'
   (func
     ('symbol', 'unknownref')
     ('symbol', '0'))
-  abort: failed to parse the definition of revset alias "unknownref": invalid symbol '$2'
+  abort: bad definition of revset alias "unknownref": invalid symbol '$2'
   [255]
 
   $ hg debugrevspec --debug --config revsetalias.anotherbadone='branch(' "tip"
   ('symbol', 'tip')
-  warning: failed to parse the definition of revset alias "anotherbadone": at 7: not a prefix: end
+  warning: bad definition of revset alias "anotherbadone": at 7: not a prefix: end
   * set:
   <baseset [9]>
   9
@@ -1985,7 +1985,7 b' test unknown reference:'
 
   $ hg debugrevspec --debug --config revsetalias.'bad name'='tip' "tip"
   ('symbol', 'tip')
-  warning: failed to parse the declaration of revset alias "bad name": at 4: invalid token
+  warning: bad declaration of revset alias "bad name": at 4: invalid token
   * set:
   <baseset [9]>
   9