patch 8.2.1032: error message for declaring a variable cannot be translated

Problem:    Error message for declaring a variable cannot be translated.
Solution:   Enclose in _().  Make environment variable a separate message.
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 871e707..52ca9e2 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -4679,12 +4679,13 @@
 
     switch (*name)
     {
-	case 'g': scope = " global"; break;
-	case 'b': scope = " buffer"; break;
-	case 'w': scope = " window"; break;
-	case 't': scope = " tab"; break;
-	case 'v': scope = " v:"; break;
-	case '$': scope = "n environment"; break;
+	case 'g': scope = _("global"); break;
+	case 'b': scope = _("buffer"); break;
+	case 'w': scope = _("window"); break;
+	case 't': scope = _("tab"); break;
+	case 'v': scope = "v:"; break;
+	case '$': semsg(_(e_declare_env_var), name); return;
+	default: return;
     }
     semsg(_(e_declare_var), scope, name);
 }