Change overhaul Config/Search Providers plus fix a couple of config links.

Change Config/Search Providers texts and descriptions.
Fix display when no providers are enabled on Config/Search Providers.
Fix failing "Search Settings" link that is shown on Config/Search Providers when Torrents Search is not enabled under that Config/Search Settings/Torrent Search tab.
Fix failing "Providers" link on Config/Search Settings/Episode Search tab.
Change case of labels in General Config/Interface/Timezone.