browser: don't use a term that is not explained in the documentation

Also, other messages that are about --operatingdir don't use the term
"confined" either.
Suggested-by: Mario Blättermann <mario.blaettermann@gmail.com>

src/browser.c

@@ -268,10 +268,10 @@ char *do_browser(char *path)
 
 #ifndef DISABLE_OPERATINGDIR
 	    if (check_operating_dir(new_path, FALSE)) {
-		/* TRANSLATORS: This refers to the option --operatingdir,
-		 * not to --restricted. */
-		statusline(ALERT, _("Can't go outside of %s "
-				"in confined mode"), full_operating_dir);
+		/* TRANSLATORS: This refers to the confining effect of the
+		 * option --operatingdir, not of --restricted. */
+		statusline(ALERT, _("Can't go outside of %s"),
+				full_operating_dir);
 		free(new_path);
 		continue;
 	    }
@@ -322,8 +322,8 @@ char *do_browser(char *path)
 	     * directory if it's ".." or if it's a symlink to a
 	     * directory outside the operating directory. */
 	    if (check_operating_dir(filelist[selected], FALSE)) {
-		statusline(ALERT, _("Can't go outside of %s "
-				"in confined mode"), full_operating_dir);
+		statusline(ALERT, _("Can't go outside of %s"),
+				full_operating_dir);
 		continue;
 	    }
 #endif