Bug#665833: Minor grammatical inconsistency

[Christian PERRIER <bubulle@debian.org>]

retitle 665833 Should use gettext plural form in "Use 'apt-get autoremove' to remove them" message
thanks

Quoting georgiytreyvus@riseup.net (georgiytreyvus@riseup.net):
> package: apt-utils
> version:: 0.8.15.10
> 
> Here is some of the output of apt-get install:
> The following package was automatically installed and is no longer required:
>   libkpathsea5
> Use 'apt-get autoremove' to remove them.

Thanks for noticing, it seems that nobody noticed until now. Moreover,
this makes things even worse in languages where there are more than 2
plural forms (such as many slavic languages).

This is a typical case where the use of Plural-Forms has been
forgotten, in the second string.

   {
      if (smallList == false)
	 ShowList(c1out, P_("The following package was automatically installed and is no longer required:",
	          "The following packages were automatically installed and are no longer required:",
	          autoRemoveCount), autoremovelist, autoremoveversions);
      else
	 ioprintf(c1out, P_("%lu package was automatically installed and is no longer required.\n",
	          "%lu packages were automatically installed and are no longer required.\n", autoRemoveCount), autoRemoveCount);
      c1out << _("Use 'apt-get autoremove' to remove them.") << std::endl;
   }

Here, the second string should use the magic used in the first one.

Hence retitling the bug...

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