Update the error message shown if a theme file is invalid.

Summary:
Update the error message shown if a theme file is invalid. This isn't E17 any more. rEec1cd25cfe666665b9e5641c91d3ad1fd2f9f11c

{F13161 size="full"}

Reviewers: zmike, raster

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1959

src/modules/conf_theme/e_int_config_theme.c

@@ -570,7 +570,7 @@ _open_test_cb(void *file)
 {
    if (!edje_file_group_exists(eet_file_get(file), "e/desktop/background"))
      e_util_dialog_show(_("Theme File Error"),
-                        _("%s is probably not an E17 theme!"),
+                        _("%s is probably not an E theme!"),
                         eet_file_get(file));
 }