Polish translation: Leftovers cleanup (files not present in /en/)

...a/newview/skins/default/xui/pl/floater_edit_day_cycle.xml

.../newview/skins/default/xui/pl/floater_edit_sky_preset.xml

...ewview/skins/default/xui/pl/floater_edit_water_preset.xml

...iew/skins/default/xui/pl/floater_environment_settings.xml

indra/newview/skins/default/xui/pl/floater_facebook.xml

indra/newview/skins/default/xui/pl/floater_flickr.xml

...ewview/skins/default/xui/pl/floater_hardware_settings.xml

indra/newview/skins/default/xui/pl/floater_twitter.xml

indra/newview/skins/default/xui/pl/panel_edit_classified.xml

indra/newview/skins/default/xui/pl/panel_edit_pick.xml

indra/newview/skins/default/xui/pl/panel_edit_profile.xml

...a/newview/skins/default/xui/pl/panel_facebook_friends.xml

indra/newview/skins/default/xui/pl/panel_facebook_photo.xml

indra/newview/skins/default/xui/pl/panel_facebook_place.xml

indra/newview/skins/default/xui/pl/panel_facebook_status.xml

indra/newview/skins/default/xui/pl/panel_flickr_account.xml

indra/newview/skins/default/xui/pl/panel_flickr_photo.xml

indra/newview/skins/default/xui/pl/panel_pick_info.xml

indra/newview/skins/default/xui/pl/panel_picks.xml

indra/newview/skins/default/xui/pl/panel_twitter_account.xml