Remove trailing ! from two error messages as this was confusing.

mercurial/commands.py

@@ -963,7 +963,7 b' def grep(ui, repo, pattern, *pats, **opt'
     try:
         regexp = re.compile(pattern, reflags)
     except Exception, inst:
-        ui.warn(_("grep: invalid match pattern: %s!\n") % inst)
+        ui.warn(_("grep: invalid match pattern: %s\n") % inst)
         return None
     sep, eol = ':', '\n'
     if opts['print0']:

mercurial/dirstate.py

@@ -286,7 +286,7 b' class dirstate(object):'
             self._changepath(f, '?')
             del self._map[f]
         except KeyError:
-            self._ui.warn(_("not in dirstate: %s!\n") % f)
+            self._ui.warn(_("not in dirstate: %s\n") % f)
 
     def clear(self):
         self._map = {}

tests/test-grep.out

@@ -1,5 +1,5 b''
 % pattern error
-grep: invalid match pattern: nothing to repeat!
+grep: invalid match pattern: nothing to repeat
 % simple
 port:4:export
 port:4:vaportight