Update docs/plugins.md

some missing fields in plugin.json
Update language files from source
Update swedish translation
Merge pull request #116 from andreus-sebes/patch-5

Update docs/plugins.md
Add support for LPCM in DVD playback

Fixes #1046
Fix buildbreak on ps3
zh_CN translation update
Merge pull request #117 from RuralHunter/master

zh_CN translation update
Update lang/pt_PT.lang

Updated european portuguese language
libav: Skip invalid CTTS

Fixes #1496
Merge pull request #118 from andreus-sebes/patch-6

Update lang/pt_PT.lang
Make box blur twice as fast
Build zlib during configure or libav won't detect it during its configure
rpi: Fix build error with latest libav
Update lang/it_IT.lang

-Added the following missing translations:
 ! Missing translation for Chapters
 ! Missing translation for Movie title
 ! Missing translation for Title, Season, Episode
-Fixed some old translated strings
Merge pull request #119 from RedSquirrel87/patch-3

Update lang/it_IT.lang
Use librtmp as submodule
HTTP: Never use HEAD to ''open'' files over HTTP

Do a minima range query request instead
ps3: Try to estimate POC to fix incorrect picutre ordering

Fixes #1483