Expand numeric literals and word abbreviation in usage error output

This avoids unneeded abbreviations, uses correct english, and should
help translators.

scripts/dpkg-scanpackages.pl

@@ -155,7 +155,7 @@ sub load_override_extra
 usage() and exit 1 if not $result;
 
 if (not @ARGV >= 1 && @ARGV <= 3) {
-    usageerr(_g("1 to 3 args expected"));
+    usageerr(_g("one to three arguments expected"));
 }
 
 my $type = defined($options{type}) ? $options{type} : 'deb';

scripts/dpkg-scansources.pl

@@ -299,7 +299,7 @@ sub main {
     my (@out);
 
     GetOptions(@Option_spec) or usage;
-    @ARGV >= 1 && @ARGV <= 3 or usageerr(_g("1 to 3 args expected\n"));
+    @ARGV >= 1 && @ARGV <= 3 or usageerr(_g("one to three arguments expected"));
 
     push @ARGV, undef		if @ARGV < 2;
     push @ARGV, ''		if @ARGV < 3;