pack "en" dictionary only with "en" langpacks

it is in the main installation tarball anyway; it was put in langpacks
that did not have its own dictionary from some strange reason

setup_native/source/packinfo/spellchecker_selection.txt

@@ -21,6 +21,7 @@ de = "de,fr,it"
 el = "el"
 en-US = "en,es,fr"
 en-GB = "en,es,fr"
+en-ZA = "en,es,fr"
 es = "an,es,fr,pt"
 et = "et"
 fr = "fr,es"

solenv/bin/modules/installer/worker.pm

@@ -2438,7 +2438,7 @@ sub set_spellcheckerlanguages
     {
         my $languagelist = "";
         if ( exists($spellcheckhash{$lang}) ) { $languagelist = $spellcheckhash{$lang}; }
-        else { $languagelist = $spellcheckhash{'en-US'}; }  # defaulting to English
+        else { $languagelist = ""; }  # no dictionary unless defined in SPELLCHECKERFILE
 
         my $langlisthash = installer::converter::convert_stringlist_into_hash(\$languagelist, ",");
         foreach my $onelang ( keys %{$langlisthash} ) { $installer::globals::spellcheckerlanguagehash{$onelang} = 1; }