Change on $txt['avatar_directory_wrong']

Signed-off-by: Suki <suki@missallsunday.com>
Change on $txt['custom_avatar_dir_wrong']

Signed-off-by: Suki <suki@missallsunday.com>
Change on $txt['setting_smileys_dir_wrong']

Signed-off-by: Suki <suki@missallsunday.com>