ssdp: If we fail to bind, retry later

Fixes #1838
ssdp: Remove unused code
zh_CN language update
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of /ps3/showtime
Merge branch 'master' into chinese
Merge pull request #145 from RuralHunter/master

zh_CN language update for coming v4.4
settings/store: Fix lock inversion

Fixes #1837
Merge branch 'master' of /ps3/showtime
Merge branch 'master' into chinese
Update de_DE.lang
Update it_IT.lang

Translated the missing strings
Merge pull request #146 from KptKloppsKopp/master

Update de_DE.lang
Merge pull request #147 from RedSquirrel87/patch-7

Updated it_IT.lang
Update sp_SP.lang
Merge pull request #148 from aldostools/patch-3

Update sp_SP.lang
upnp: Add more URLs in device description

Also add some kind of root page in Showtime's HTTP server

Fixes #1843
Update pl_PL.lang

Updated translation, fixed typos
Merge pull request #149 from copernic-us/patch-4

Update pl_PL.lang
Make miner also translatable